/*!
 * Vue.js v2.5.8
 * (c) 2014-2017 Evan You
 * Released under the MIT License.
 */
/*  */

const emptyObject = Object.freeze({});

// these helpers produces better vm code in JS engines due to their
// explicitness and function inlining
function isUndef(v) {
    return v === undefined || v === null
}

function isDef(v) {
    return v !== undefined && v !== null
}

function isTrue(v) {
    return v === true
}

function isFalse(v) {
    return v === false
}

/**
 * Check if value is primitive
 */
function isPrimitive(value) {
    return (
        typeof value === 'string' ||
        typeof value === 'number' ||
        typeof value === 'boolean'
    )
}

/**
 * Quick object check - this is primarily used to tell
 * Objects from primitive values when we know the value
 * is a JSON-compliant type.
 */
function isObject(obj) {
    return obj !== null && typeof obj === 'object'
}

/**
 * Get the raw type string of a value e.g. [object Object]
 */
const _toString = Object.prototype.toString;

function toRawType(value) {
    return _toString.call(value).slice(8, -1)
}

/**
 * Strict object type check. Only returns true
 * for plain JavaScript objects.
 */
function isPlainObject(obj) {
    return _toString.call(obj) === '[object Object]'
}

function isRegExp(v) {
    return _toString.call(v) === '[object RegExp]'
}

/**
 * Check if val is a valid array index.
 */
function isValidArrayIndex(val) {
    const n = parseFloat(String(val));
    return n >= 0 && Math.floor(n) === n && isFinite(val)
}

/**
 * Convert a value to a string that is actually rendered.
 */
function toString(val) {
    return val == null
        ? ''
        : typeof val === 'object'
            ? JSON.stringify(val, null, 2)
            : String(val)
}

/**
 * Convert a input value to a number for persistence.
 * If the conversion fails, return original string.
 */
function toNumber(val) {
    const n = parseFloat(val);
    return isNaN(n) ? val : n
}

/**
 * Make a map and return a function for checking if a key
 * is in that map.
 */
function makeMap(
    str,
    expectsLowerCase
) {
    const map = Object.create(null);
    const list = str.split(',');
    for (let i = 0; i < list.length; i++) {
        map[list[i]] = true;
    }
    return expectsLowerCase
        ? val =
>
    map[val.toLowerCase()]
:
    val =
>
    map[val]
}

/**
 * Check if a tag is a built-in tag.
 */
const isBuiltInTag = makeMap('slot,component', true);

/**
 * Check if a attribute is a reserved attribute.
 */
const isReservedAttribute = makeMap('key,ref,slot,slot-scope,is');

/**
 * Remove an item from an array
 */
function remove(arr, item) {
    if (arr.length) {
        const index = arr.indexOf(item);
        if (index > -1) {
            return arr.splice(index, 1)
        }
    }
}

/**
 * Check whether the object has the property.
 */
const hasOwnProperty = Object.prototype.hasOwnProperty;

function hasOwn(obj, key) {
    return hasOwnProperty.call(obj, key)
}

/**
 * Create a cached version of a pure function.
 */
function cached(fn) {
    const cache = Object.create(null);
    return (function cachedFn(str) {
        const hit = cache[str];
        return hit || (cache[str] = fn(str))
    })
}

/**
 * Camelize a hyphen-delimited string.
 */
const camelizeRE = /-(\w)/g;
const camelize = cached((str) = > {
    return str.replace(camelizeRE, (_, c) = > c ? c.toUpperCase() : ''
)
})
;

/**
 * Capitalize a string.
 */
const capitalize = cached((str) = > {
    return str.charAt(0).toUpperCase() + str.slice(1)
}
)
;

/**
 * Hyphenate a camelCase string.
 */
const hyphenateRE = /\B([A-Z])/g;
const hyphenate = cached((str) = > {
    return str.replace(hyphenateRE, '-$1').toLowerCase()
}
)
;

/**
 * Simple bind, faster than native
 */
function bind(fn, ctx) {
    function boundFn(a) {
        const l = arguments.length;
        return l
            ? l > 1
                ? fn.apply(ctx, arguments)
                : fn.call(ctx, a)
            : fn.call(ctx)
    }

    // record original fn length
    boundFn._length = fn.length;
    return boundFn
}

/**
 * Convert an Array-like object to a real Array.
 */
function toArray(list, start) {
    start = start || 0;
    let i = list.length - start;
    const ret = new Array(i);
    while (i--) {
        ret[i] = list[i + start];
    }
    return ret
}

/**
 * Mix properties into target object.
 */
function extend(to, _from) {
    for (const key in _from) {
        to[key] = _from[key];
    }
    return to
}

/**
 * Merge an Array of Objects into a single Object.
 */
function toObject(arr) {
    const res = {};
    for (let i = 0; i < arr.length; i++) {
        if (arr[i]) {
            extend(res, arr[i]);
        }
    }
    return res
}

/**
 * Perform no operation.
 * Stubbing args to make Flow happy without leaving useless transpiled code
 * with ...rest (https://flow.org/blog/2017/05/07/Strict-Function-Call-Arity/)
 */
function noop(a, b, c) {
}

/**
 * Always return false.
 */
const no = (a, b, c) =
>
false;

/**
 * Return same value
 */
const identity = (_) =
>
_;

/**
 * Generate a static keys string from compiler modules.
 */
function genStaticKeys(modules) {
    return modules.reduce((keys, m) = > {
        return keys.concat(m.staticKeys || [])
    }, []
).
    join(',')
}

/**
 * Check if two values are loosely equal - that is,
 * if they are plain objects, do they have the same shape?
 */
function looseEqual(a, b) {
    if (a === b) return true
    const isObjectA = isObject(a);
    const isObjectB = isObject(b);
    if (isObjectA && isObjectB) {
        try {
            const isArrayA = Array.isArray(a);
            const isArrayB = Array.isArray(b);
            if (isArrayA && isArrayB) {
                return a.length === b.length && a.every((e, i) = > {
                    return looseEqual(e, b[i])
                }
            )
            } else if (!isArrayA && !isArrayB) {
                const keysA = Object.keys(a);
                const keysB = Object.keys(b);
                return keysA.length === keysB.length && keysA.every(key = > {
                    return looseEqual(a[key], b[key])
                }
            )
            } else {
                /* istanbul ignore next */
                return false
            }
        } catch (e) {
            /* istanbul ignore next */
            return false
        }
    } else if (!isObjectA && !isObjectB) {
        return String(a) === String(b)
    } else {
        return false
    }
}

function looseIndexOf(arr, val) {
    for (let i = 0; i < arr.length; i++) {
        if (looseEqual(arr[i], val)) return i
    }
    return -1
}

/**
 * Ensure a function is called only once.
 */
function once(fn) {
    let called = false;
    return function () {
        if (!called) {
            called = true;
            fn.apply(this, arguments);
        }
    }
}

const SSR_ATTR = 'data-server-rendered';

const ASSET_TYPES = [
    'component',
    'directive',
    'filter'
];

const LIFECYCLE_HOOKS = [
    'beforeCreate',
    'created',
    'beforeMount',
    'mounted',
    'beforeUpdate',
    'updated',
    'beforeDestroy',
    'destroyed',
    'activated',
    'deactivated',
    'errorCaptured'
];

/*  */

var config = ({
    /**
     * Option merge strategies (used in core/util/options)
     */
    optionMergeStrategies: Object.create(null),

    /**
     * Whether to suppress warnings.
     */
    silent: false,

    /**
     * Show production mode tip message on boot?
     */
    productionTip: "development" !== 'production',

    /**
     * Whether to enable devtools
     */
    devtools: "development" !== 'production',

    /**
     * Whether to record perf
     */
    performance: false,

    /**
     * Error handler for watcher errors
     */
    errorHandler: null,

    /**
     * Warn handler for watcher warns
     */
    warnHandler: null,

    /**
     * Ignore certain custom elements
     */
    ignoredElements: [],

    /**
     * Custom user key aliases for v-on
     */
    keyCodes: Object.create(null),

    /**
     * Check if a tag is reserved so that it cannot be registered as a
     * component. This is platform-dependent and may be overwritten.
     */
    isReservedTag: no,

    /**
     * Check if an attribute is reserved so that it cannot be used as a component
     * prop. This is platform-dependent and may be overwritten.
     */
    isReservedAttr: no,

    /**
     * Check if a tag is an unknown element.
     * Platform-dependent.
     */
    isUnknownElement: no,

    /**
     * Get the namespace of an element
     */
    getTagNamespace: noop,

    /**
     * Parse the real tag name for the specific platform.
     */
    parsePlatformTagName: identity,

    /**
     * Check if an attribute must be bound using property, e.g. value
     * Platform-dependent.
     */
    mustUseProp: no,

    /**
     * Exposed for legacy reasons
     */
    _lifecycleHooks: LIFECYCLE_HOOKS
});

/*  */

/**
 * Check if a string starts with $ or _
 */
function isReserved(str) {
    const c = (str + '').charCodeAt(0);
    return c === 0x24 || c === 0x5F
}

/**
 * Define a property.
 */
function def(obj, key, val, enumerable) {
    Object.defineProperty(obj, key, {
        value: val,
        enumerable: !!enumerable,
        writable: true,
        configurable: true
    });
}

/**
 * Parse simple path.
 */
const bailRE = /[^\w.$]/;

function parsePath(path) {
    if (bailRE.test(path)) {
        return
    }
    const segments = path.split('.');
    return function (obj) {
        for (let i = 0; i < segments.length; i++) {
            if (!obj) return
            obj = obj[segments[i]];
        }
        return obj
    }
}

/*  */


// can we use __proto__?
const hasProto = '__proto__' in {};

// Browser environment sniffing
const inBrowser = typeof window !== 'undefined';
const inWeex = typeof WXEnvironment !== 'undefined' && !!WXEnvironment.platform;
const weexPlatform = inWeex && WXEnvironment.platform.toLowerCase();
const UA = inBrowser && window.navigator.userAgent.toLowerCase();
const isIE = UA && /msie|trident/.test(UA);
const isIE9 = UA && UA.indexOf('msie 9.0') > 0;
const isEdge = UA && UA.indexOf('edge/') > 0;
const isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android');
const isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios');
const isChrome = UA && /chrome\/\d+/.test(UA) && !isEdge;

// Firefox has a "watch" function on Object.prototype...
const nativeWatch = ({}).watch;

let supportsPassive = false;
if (inBrowser) {
    try {
        const opts = {};
        Object.defineProperty(opts, 'passive', ({
            get() {
                /* istanbul ignore next */
                supportsPassive = true;
            }
        })); // https://github.com/facebook/flow/issues/285
        window.addEventListener('test-passive', null, opts);
    } catch (e) {
    }
}

// this needs to be lazy-evaled because vue may be required before
// vue-server-renderer can set VUE_ENV
let _isServer;
const isServerRendering = () =
>
{
    if (_isServer === undefined) {
        /* istanbul ignore if */
        if (!inBrowser && typeof global !== 'undefined') {
            // detect presence of vue-server-renderer and avoid
            // Webpack shimming the process
            _isServer = global['process'].env.VUE_ENV === 'server';
        } else {
            _isServer = false;
        }
    }
    return _isServer
}
;

// detect devtools
const devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;

/* istanbul ignore next */
function isNative(Ctor) {
    return typeof Ctor === 'function' && /native code/.test(Ctor.toString())
}

const hasSymbol =
    typeof Symbol !== 'undefined' && isNative(Symbol) &&
    typeof Reflect !== 'undefined' && isNative(Reflect.ownKeys);

let _Set;
/* istanbul ignore if */ // $flow-disable-line
if (typeof Set !== 'undefined' && isNative(Set)) {
    // use native Set when available.
    _Set = Set;
} else {
    // a non-standard Set polyfill that only works with primitive keys.
    _Set = class Set {

        constructor() {
            this.set = Object.create(null);
        }

        has(key) {
            return this.set[key] === true
        }

        add(key) {
            this.set[key] = true;
        }

        clear() {
            this.set = Object.create(null);
        }
    };
}

/*  */

let warn = noop;
let tip = noop;
let generateComponentTrace = (noop); // work around flow check
let formatComponentName = (noop);

{
    const hasConsole = typeof console !== 'undefined';
    const classifyRE = /(?:^|[-_])(\w)/g;
    const classify = str =
>
    str
        .replace(classifyRE, c = > c.toUpperCase()
)
.
    replace(/[-_]/g, '');

    warn = (msg, vm) =
>
    {
        const trace = vm ? generateComponentTrace(vm) : '';

        if (config.warnHandler) {
            config.warnHandler.call(null, msg, vm, trace);
        } else if (hasConsole && (!config.silent)) {
            console.error(`[Vue warn]: ${msg}${trace}`);
        }
    }
    ;

    tip = (msg, vm) =
>
    {
        if (hasConsole && (!config.silent)) {
            console.warn(`[Vue tip]: ${msg}` + (
                vm ? generateComponentTrace(vm) : ''
            ));
        }
    }
    ;

    formatComponentName = (vm, includeFile) =
>
    {
        if (vm.$root === vm) {
            return '<Root>'
        }
        const options = typeof vm === 'function' && vm.cid != null
            ? vm.options
            : vm._isVue
                ? vm.$options || vm.constructor.options
                : vm || {};
        let name = options.name || options._componentTag;
        const file = options.__file;
        if (!name && file) {
            const match = file.match(/([^/\\]+)\.vue$/);
            name = match && match[1];
        }

        return (
            (name ? `<${classify(name)}>` : `<Anonymous>`) +
            (file && includeFile !== false ? ` at ${file}` : '')
        )
    }
    ;

    const repeat = (str, n) =
>
    {
        let res = '';
        while (n) {
            if (n % 2 === 1) res += str;
            if (n > 1) str += str;
            n >>= 1;
        }
        return res
    }
    ;

    generateComponentTrace = vm =
>
    {
        if (vm._isVue && vm.$parent) {
            const tree = [];
            let currentRecursiveSequence = 0;
            while (vm) {
                if (tree.length > 0) {
                    const last = tree[tree.length - 1];
                    if (last.constructor === vm.constructor) {
                        currentRecursiveSequence++;
                        vm = vm.$parent;
                        continue
                    } else if (currentRecursiveSequence > 0) {
                        tree[tree.length - 1] = [last, currentRecursiveSequence];
                        currentRecursiveSequence = 0;
                    }
                }
                tree.push(vm);
                vm = vm.$parent;
            }
            return '\n\nfound in\n\n' + tree
                .map((vm, i) = > `${
                i === 0 ? '---> ' : repeat(' ', 5 + i * 2)
                }${
                Array.isArray(vm)
                    ? `${formatComponentName(vm[0])}... (${vm[1]} recursive calls)`
                    : formatComponentName(vm)
                }`
        )
        .
            join('\n')
        } else {
            return `\n\n(found in ${formatComponentName(vm)})`
        }
    }
    ;
}

/*  */


let uid = 0;

/**
 * A dep is an observable that can have multiple
 * directives subscribing to it.
 */
class Dep {


    constructor() {
        this.id = uid++;
        this.subs = [];
    }

    addSub(sub) {
        this.subs.push(sub);
    }

    removeSub(sub) {
        remove(this.subs, sub);
    }

    depend() {
        if (Dep.target) {
            Dep.target.addDep(this);
        }
    }

    notify() {
        // stabilize the subscriber list first
        const subs = this.subs.slice();
        for (let i = 0, l = subs.length; i < l; i++) {
            subs[i].update();
        }
    }
}

// the current target watcher being evaluated.
// this is globally unique because there could be only one
// watcher being evaluated at any time.
Dep.target = null;
const targetStack = [];

function pushTarget(_target) {
    if (Dep.target) targetStack.push(Dep.target);
    Dep.target = _target;
}

function popTarget() {
    Dep.target = targetStack.pop();
}

/*  */

class VNode {


    // rendered in this component's scope


    // component instance
    // component placeholder node

    // strictly internal
    // contains raw HTML? (server only)
    // hoisted static node
    // necessary for enter transition check
    // empty comment placeholder?
    // is a cloned node?
    // is a v-once node?
    // async component factory function


    // real context vm for functional nodes
    // for SSR caching
    // functioanl scope id support

    constructor(
        tag,
        data,
        children,
        text,
        elm,
        context,
        componentOptions,
        asyncFactory
    ) {
        this.tag = tag;
        this.data = data;
        this.children = children;
        this.text = text;
        this.elm = elm;
        this.ns = undefined;
        this.context = context;
        this.functionalContext = undefined;
        this.functionalOptions = undefined;
        this.functionalScopeId = undefined;
        this.key = data && data.key;
        this.componentOptions = componentOptions;
        this.componentInstance = undefined;
        this.parent = undefined;
        this.raw = false;
        this.isStatic = false;
        this.isRootInsert = true;
        this.isComment = false;
        this.isCloned = false;
        this.isOnce = false;
        this.asyncFactory = asyncFactory;
        this.asyncMeta = undefined;
        this.isAsyncPlaceholder = false;
    }

    // DEPRECATED: alias for componentInstance for backwards compat.
    /* istanbul ignore next */
    get child() {
        return this.componentInstance
    }
}

const createEmptyVNode = (text = '') =
>
{
    const node = new VNode();
    node.text = text;
    node.isComment = true;
    return node
}
;

function createTextVNode(val) {
    return new VNode(undefined, undefined, undefined, String(val))
}

// optimized shallow clone
// used for static nodes and slot nodes because they may be reused across
// multiple renders, cloning them avoids errors when DOM manipulations rely
// on their elm reference.
function cloneVNode(vnode, deep) {
    const componentOptions = vnode.componentOptions;
    const cloned = new VNode(
        vnode.tag,
        vnode.data,
        vnode.children,
        vnode.text,
        vnode.elm,
        vnode.context,
        componentOptions,
        vnode.asyncFactory
    );
    cloned.ns = vnode.ns;
    cloned.isStatic = vnode.isStatic;
    cloned.key = vnode.key;
    cloned.isComment = vnode.isComment;
    cloned.isCloned = true;
    if (deep) {
        if (vnode.children) {
            cloned.children = cloneVNodes(vnode.children, true);
        }
        if (componentOptions && componentOptions.children) {
            componentOptions.children = cloneVNodes(componentOptions.children, true);
        }
    }
    return cloned
}

function cloneVNodes(vnodes, deep) {
    const len = vnodes.length;
    const res = new Array(len);
    for (let i = 0; i < len; i++) {
        res[i] = cloneVNode(vnodes[i], deep);
    }
    return res
}

/*
 * not type checking this file because flow doesn't play well with
 * dynamically accessing methods on Array prototype
 */

const arrayProto = Array.prototype;
const arrayMethods = Object.create(arrayProto);
[
    'push',
    'pop',
    'shift',
    'unshift',
    'splice',
    'sort',
    'reverse'
]
    .forEach(function (method) {
        // cache original method
        const original = arrayProto[method];
        def(arrayMethods, method, function mutator(...args)
        {
            const result = original.apply(this, args);
            const ob = this.__ob__;
            let inserted;
            switch (method) {
                case 'push':
                case 'unshift':
                    inserted = args;
                    break
                case 'splice':
                    inserted = args.slice(2);
                    break
            }
            if (inserted) ob.observeArray(inserted);
            // notify change
            ob.dep.notify();
            return result
        }
    )
        ;
    });

/*  */

const arrayKeys = Object.getOwnPropertyNames(arrayMethods);

/**
 * By default, when a reactive property is set, the new value is
 * also converted to become reactive. However when passing down props,
 * we don't want to force conversion because the value may be a nested value
 * under a frozen data structure. Converting it would defeat the optimization.
 */
const observerState = {
    shouldConvert: true
};

/**
 * Observer class that are attached to each observed
 * object. Once attached, the observer converts target
 * object's property keys into getter/setters that
 * collect dependencies and dispatches updates.
 */
class Observer {


    // number of vms that has this object as root $data

    constructor(value) {
        this.value = value;
        this.dep = new Dep();
        this.vmCount = 0;
        def(value, '__ob__', this);
        if (Array.isArray(value)) {
            const augment = hasProto
                ? protoAugment
                : copyAugment;
            augment(value, arrayMethods, arrayKeys);
            this.observeArray(value);
        } else {
            this.walk(value);
        }
    }

    /**
     * Walk through each property and convert them into
     * getter/setters. This method should only be called when
     * value type is Object.
     */
    walk(obj) {
        const keys = Object.keys(obj);
        for (let i = 0; i < keys.length; i++) {
            defineReactive(obj, keys[i], obj[keys[i]]);
        }
    }

    /**
     * Observe a list of Array items.
     */
    observeArray(items) {
        for (let i = 0, l = items.length; i < l; i++) {
            observe(items[i]);
        }
    }
}

// helpers

/**
 * Augment an target Object or Array by intercepting
 * the prototype chain using __proto__
 */
function protoAugment(target, src, keys) {
    /* eslint-disable no-proto */
    target.__proto__ = src;
    /* eslint-enable no-proto */
}

/**
 * Augment an target Object or Array by defining
 * hidden properties.
 */

/* istanbul ignore next */
function copyAugment(target, src, keys) {
    for (let i = 0, l = keys.length; i < l; i++) {
        const key = keys[i];
        def(target, key, src[key]);
    }
}

/**
 * Attempt to create an observer instance for a value,
 * returns the new observer if successfully observed,
 * or the existing observer if the value already has one.
 */
function observe(value, asRootData) {
    if (!isObject(value) || value instanceof VNode) {
        return
    }
    let ob;
    if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
        ob = value.__ob__;
    } else if (
        observerState.shouldConvert &&
        !isServerRendering() &&
        (Array.isArray(value) || isPlainObject(value)) &&
        Object.isExtensible(value) &&
        !value._isVue
    ) {
        ob = new Observer(value);
    }
    if (asRootData && ob) {
        ob.vmCount++;
    }
    return ob
}

/**
 * Define a reactive property on an Object.
 */
function defineReactive(
    obj,
    key,
    val,
    customSetter,
    shallow
) {
    const dep = new Dep();

    const property = Object.getOwnPropertyDescriptor(obj, key);
    if (property && property.configurable === false) {
        return
    }

    // cater for pre-defined getter/setters
    const getter = property && property.get;
    const setter = property && property.set;

    let childOb = !shallow && observe(val);
    Object.defineProperty(obj, key, {
        enumerable: true,
        configurable: true,
        get: function reactiveGetter() {
            const value = getter ? getter.call(obj) : val;
            if (Dep.target) {
                dep.depend();
                if (childOb) {
                    childOb.dep.depend();
                    if (Array.isArray(value)) {
                        dependArray(value);
                    }
                }
            }
            return value
        },
        set: function reactiveSetter(newVal) {
            const value = getter ? getter.call(obj) : val;
            /* eslint-disable no-self-compare */
            if (newVal === value || (newVal !== newVal && value !== value)) {
                return
            }
            /* eslint-enable no-self-compare */
            if ("development" !== 'production' && customSetter) {
                customSetter();
            }
            if (setter) {
                setter.call(obj, newVal);
            } else {
                val = newVal;
            }
            childOb = !shallow && observe(newVal);
            dep.notify();
        }
    });
}

/**
 * Set a property on an object. Adds the new property and
 * triggers change notification if the property doesn't
 * already exist.
 */
function set(target, key, val) {
    if (Array.isArray(target) && isValidArrayIndex(key)) {
        target.length = Math.max(target.length, key);
        target.splice(key, 1, val);
        return val
    }
    if (key in target && !(key in Object.prototype)) {
        target[key] = val;
        return val
    }
    const ob = (target).__ob__;
    if (target._isVue || (ob && ob.vmCount)) {
        "development" !== 'production' && warn(
            'Avoid adding reactive properties to a Vue instance or its root $data ' +
            'at runtime - declare it upfront in the data option.'
        );
        return val
    }
    if (!ob) {
        target[key] = val;
        return val
    }
    defineReactive(ob.value, key, val);
    ob.dep.notify();
    return val
}

/**
 * Delete a property and trigger change if necessary.
 */
function del(target, key) {
    if (Array.isArray(target) && isValidArrayIndex(key)) {
        target.splice(key, 1);
        return
    }
    const ob = (target).__ob__;
    if (target._isVue || (ob && ob.vmCount)) {
        "development" !== 'production' && warn(
            'Avoid deleting properties on a Vue instance or its root $data ' +
            '- just set it to null.'
        );
        return
    }
    if (!hasOwn(target, key)) {
        return
    }
    delete target[key];
    if (!ob) {
        return
    }
    ob.dep.notify();
}

/**
 * Collect dependencies on array elements when the array is touched, since
 * we cannot intercept array element access like property getters.
 */
function dependArray(value) {
    for (let e, i = 0, l = value.length; i < l; i++) {
        e = value[i];
        e && e.__ob__ && e.__ob__.dep.depend();
        if (Array.isArray(e)) {
            dependArray(e);
        }
    }
}

/*  */

/**
 * Option overwriting strategies are functions that handle
 * how to merge a parent option value and a child option
 * value into the final value.
 */
const strats = config.optionMergeStrategies;

/**
 * Options with restrictions
 */
{
    strats.el = strats.propsData = function (parent, child, vm, key) {
        if (!vm) {
            warn(
                `option "${key}" can only be used during instance ` +
                'creation with the `new` keyword.'
            );
        }
        return defaultStrat(parent, child)
    };
}

/**
 * Helper that recursively merges two data objects together.
 */
function mergeData(to, from) {
    if (!from) return to
    let key, toVal, fromVal;
    const keys = Object.keys(from);
    for (let i = 0; i < keys.length; i++) {
        key = keys[i];
        toVal = to[key];
        fromVal = from[key];
        if (!hasOwn(to, key)) {
            set(to, key, fromVal);
        } else if (isPlainObject(toVal) && isPlainObject(fromVal)) {
            mergeData(toVal, fromVal);
        }
    }
    return to
}

/**
 * Data
 */
function mergeDataOrFn(
    parentVal,
    childVal,
    vm
) {
    if (!vm) {
        // in a Vue.extend merge, both should be functions
        if (!childVal) {
            return parentVal
        }
        if (!parentVal) {
            return childVal
        }
        // when parentVal & childVal are both present,
        // we need to return a function that returns the
        // merged result of both functions... no need to
        // check if parentVal is a function here because
        // it has to be a function to pass previous merges.
        return function mergedDataFn() {
            return mergeData(
                typeof childVal === 'function' ? childVal.call(this) : childVal,
                typeof parentVal === 'function' ? parentVal.call(this) : parentVal
            )
        }
    } else {
        return function mergedInstanceDataFn() {
            // instance merge
            const instanceData = typeof childVal === 'function'
                ? childVal.call(vm)
                : childVal;
            const defaultData = typeof parentVal === 'function'
                ? parentVal.call(vm)
                : parentVal;
            if (instanceData) {
                return mergeData(instanceData, defaultData)
            } else {
                return defaultData
            }
        }
    }
}

strats.data = function (
    parentVal,
    childVal,
    vm
) {
    if (!vm) {
        if (childVal && typeof childVal !== 'function') {
            "development" !== 'production' && warn(
                'The "data" option should be a function ' +
                'that returns a per-instance value in component ' +
                'definitions.',
                vm
            );

            return parentVal
        }
        return mergeDataOrFn(parentVal, childVal)
    }

    return mergeDataOrFn(parentVal, childVal, vm)
};

/**
 * Hooks and props are merged as arrays.
 */
function mergeHook(
    parentVal,
    childVal
) {
    return childVal
        ? parentVal
            ? parentVal.concat(childVal)
            : Array.isArray(childVal)
                ? childVal
                : [childVal]
        : parentVal
}

LIFECYCLE_HOOKS.forEach(hook = > {
    strats[hook] = mergeHook;
})
;

/**
 * Assets
 *
 * When a vm is present (instance creation), we need to do
 * a three-way merge between constructor options, instance
 * options and parent options.
 */
function mergeAssets(
    parentVal,
    childVal,
    vm,
    key
) {
    const res = Object.create(parentVal || null);
    if (childVal) {
        "development" !== 'production' && assertObjectType(key, childVal, vm);
        return extend(res, childVal)
    } else {
        return res
    }
}

ASSET_TYPES.forEach(function (type) {
    strats[type + 's'] = mergeAssets;
});

/**
 * Watchers.
 *
 * Watchers hashes should not overwrite one
 * another, so we merge them as arrays.
 */
strats.watch = function (
    parentVal,
    childVal,
    vm,
    key
) {
    // work around Firefox's Object.prototype.watch...
    if (parentVal === nativeWatch) parentVal = undefined;
    if (childVal === nativeWatch) childVal = undefined;
    /* istanbul ignore if */
    if (!childVal) return Object.create(parentVal || null)
    {
        assertObjectType(key, childVal, vm);
    }
    if (!parentVal) return childVal
    const ret = {};
    extend(ret, parentVal);
    for (const key in childVal) {
        let parent = ret[key];
        const child = childVal[key];
        if (parent && !Array.isArray(parent)) {
            parent = [parent];
        }
        ret[key] = parent
            ? parent.concat(child)
            : Array.isArray(child) ? child : [child];
    }
    return ret
};

/**
 * Other object hashes.
 */
strats.props =
    strats.methods =
        strats.inject =
            strats.computed = function (
                parentVal,
                childVal,
                vm,
                key
            ) {
                if (childVal && "development" !== 'production') {
                    assertObjectType(key, childVal, vm);
                }
                if (!parentVal) return childVal
                const ret = Object.create(null);
                extend(ret, parentVal);
                if (childVal) extend(ret, childVal);
                return ret
            };
strats.provide = mergeDataOrFn;

/**
 * Default strategy.
 */
const defaultStrat = function (parentVal, childVal) {
    return childVal === undefined
        ? parentVal
        : childVal
};

/**
 * Validate component names
 */
function checkComponents(options) {
    for (const key in options.components) {
        const lower = key.toLowerCase();
        if (isBuiltInTag(lower) || config.isReservedTag(lower)) {
            warn(
                'Do not use built-in or reserved HTML elements as component ' +
                'id: ' + key
            );
        }
    }
}

/**
 * Ensure all props option syntax are normalized into the
 * Object-based format.
 */
function normalizeProps(options, vm) {
    const props = options.props;
    if (!props) return
    const res = {};
    let i, val, name;
    if (Array.isArray(props)) {
        i = props.length;
        while (i--) {
            val = props[i];
            if (typeof val === 'string') {
                name = camelize(val);
                res[name] = {type: null};
            } else {
                warn('props must be strings when using array syntax.');
            }
        }
    } else if (isPlainObject(props)) {
        for (const key in props) {
            val = props[key];
            name = camelize(key);
            res[name] = isPlainObject(val)
                ? val
                : {type: val};
        }
    } else {
        warn(
            `Invalid value for option "props": expected an Array or an Object, ` +
            `but got ${toRawType(props)}.`,
            vm
        );
    }
    options.props = res;
}

/**
 * Normalize all injections into Object-based format
 */
function normalizeInject(options, vm) {
    const inject = options.inject;
    const normalized = options.inject = {};
    if (Array.isArray(inject)) {
        for (let i = 0; i < inject.length; i++) {
            normalized[inject[i]] = {from: inject[i]};
        }
    } else if (isPlainObject(inject)) {
        for (const key in inject) {
            const val = inject[key];
            normalized[key] = isPlainObject(val)
                ? extend({from: key}, val)
                : {from: val};
        }
    } else if ("development" !== 'production' && inject) {
        warn(
            `Invalid value for option "inject": expected an Array or an Object, ` +
            `but got ${toRawType(inject)}.`,
            vm
        );
    }
}

/**
 * Normalize raw function directives into object format.
 */
function normalizeDirectives(options) {
    const dirs = options.directives;
    if (dirs) {
        for (const key in dirs) {
            const def = dirs[key];
            if (typeof def === 'function') {
                dirs[key] = {bind: def, update: def};
            }
        }
    }
}

function assertObjectType(name, value, vm) {
    if (!isPlainObject(value)) {
        warn(
            `Invalid value for option "${name}": expected an Object, ` +
            `but got ${toRawType(value)}.`,
            vm
        );
    }
}

/**
 * Merge two option objects into a new one.
 * Core utility used in both instantiation and inheritance.
 */
function mergeOptions(
    parent,
    child,
    vm
) {
    {
        checkComponents(child);
    }

    if (typeof child === 'function') {
        child = child.options;
    }

    normalizeProps(child, vm);
    normalizeInject(child, vm);
    normalizeDirectives(child);
    const extendsFrom = child.extends;
    if (extendsFrom) {
        parent = mergeOptions(parent, extendsFrom, vm);
    }
    if (child.mixins) {
        for (let i = 0, l = child.mixins.length; i < l; i++) {
            parent = mergeOptions(parent, child.mixins[i], vm);
        }
    }
    const options = {};
    let key;
    for (key in parent) {
        mergeField(key);
    }
    for (key in child) {
        if (!hasOwn(parent, key)) {
            mergeField(key);
        }
    }

    function mergeField(key) {
        const strat = strats[key] || defaultStrat;
        options[key] = strat(parent[key], child[key], vm, key);
    }

    return options
}

/**
 * Resolve an asset.
 * This function is used because child instances need access
 * to assets defined in its ancestor chain.
 */
function resolveAsset(
    options,
    type,
    id,
    warnMissing
) {
    /* istanbul ignore if */
    if (typeof id !== 'string') {
        return
    }
    const assets = options[type];
    // check local registration variations first
    if (hasOwn(assets, id)) return assets[id]
    const camelizedId = camelize(id);
    if (hasOwn(assets, camelizedId)) return assets[camelizedId]
    const PascalCaseId = capitalize(camelizedId);
    if (hasOwn(assets, PascalCaseId)) return assets[PascalCaseId]
    // fallback to prototype chain
    const res = assets[id] || assets[camelizedId] || assets[PascalCaseId];
    if ("development" !== 'production' && warnMissing && !res) {
        warn(
            'Failed to resolve ' + type.slice(0, -1) + ': ' + id,
            options
        );
    }
    return res
}

/*  */

function validateProp(
    key,
    propOptions,
    propsData,
    vm
) {
    const prop = propOptions[key];
    const absent = !hasOwn(propsData, key);
    let value = propsData[key];
    // handle boolean props
    if (isType(Boolean, prop.type)) {
        if (absent && !hasOwn(prop, 'default')) {
            value = false;
        } else if (!isType(String, prop.type) && (value === '' || value === hyphenate(key))) {
            value = true;
        }
    }
    // check default value
    if (value === undefined) {
        value = getPropDefaultValue(vm, prop, key);
        // since the default value is a fresh copy,
        // make sure to observe it.
        const prevShouldConvert = observerState.shouldConvert;
        observerState.shouldConvert = true;
        observe(value);
        observerState.shouldConvert = prevShouldConvert;
    }
    {
        assertProp(prop, key, value, vm, absent);
    }
    return value
}

/**
 * Get the default value of a prop.
 */
function getPropDefaultValue(vm, prop, key) {
    // no default, return undefined
    if (!hasOwn(prop, 'default')) {
        return undefined
    }
    const def = prop.default;
    // warn against non-factory defaults for Object & Array
    if ("development" !== 'production' && isObject(def)) {
        warn(
            'Invalid default value for prop "' + key + '": ' +
            'Props with type Object/Array must use a factory function ' +
            'to return the default value.',
            vm
        );
    }
    // the raw prop value was also undefined from previous render,
    // return previous default value to avoid unnecessary watcher trigger
    if (vm && vm.$options.propsData &&
        vm.$options.propsData[key] === undefined &&
        vm._props[key] !== undefined
    ) {
        return vm._props[key]
    }
    // call factory function for non-Function types
    // a value is Function if its prototype is function even across different execution context
    return typeof def === 'function' && getType(prop.type) !== 'Function'
        ? def.call(vm)
        : def
}

/**
 * Assert whether a prop is valid.
 */
function assertProp(
    prop,
    name,
    value,
    vm,
    absent
) {
    if (prop.required && absent) {
        warn(
            'Missing required prop: "' + name + '"',
            vm
        );
        return
    }
    if (value == null && !prop.required) {
        return
    }
    let type = prop.type;
    let valid = !type || type === true;
    const expectedTypes = [];
    if (type) {
        if (!Array.isArray(type)) {
            type = [type];
        }
        for (let i = 0; i < type.length && !valid; i++) {
            const assertedType = assertType(value, type[i]);
            expectedTypes.push(assertedType.expectedType || '');
            valid = assertedType.valid;
        }
    }
    if (!valid) {
        warn(
            `Invalid prop: type check failed for prop "${name}".` +
            ` Expected ${expectedTypes.map(capitalize).join(', ')}` +
            `, got ${toRawType(value)}.`,
            vm
        );
        return
    }
    const validator = prop.validator;
    if (validator) {
        if (!validator(value)) {
            warn(
                'Invalid prop: custom validator check failed for prop "' + name + '".',
                vm
            );
        }
    }
}

const simpleCheckRE = /^(String|Number|Boolean|Function|Symbol)$/;

function assertType(value, type) {
    let valid;
    const expectedType = getType(type);
    if (simpleCheckRE.test(expectedType)) {
        const t = typeof value;
        valid = t === expectedType.toLowerCase();
        // for primitive wrapper objects
        if (!valid && t === 'object') {
            valid = value instanceof type;
        }
    } else if (expectedType === 'Object') {
        valid = isPlainObject(value);
    } else if (expectedType === 'Array') {
        valid = Array.isArray(value);
    } else {
        valid = value instanceof type;
    }
    return {
        valid,
        expectedType
    }
}

/**
 * Use function string name to check built-in types,
 * because a simple equality check will fail when running
 * across different vms / iframes.
 */
function getType(fn) {
    const match = fn && fn.toString().match(/^\s*function (\w+)/);
    return match ? match[1] : ''
}

function isType(type, fn) {
    if (!Array.isArray(fn)) {
        return getType(fn) === getType(type)
    }
    for (let i = 0, len = fn.length; i < len; i++) {
        if (getType(fn[i]) === getType(type)) {
            return true
        }
    }
    /* istanbul ignore next */
    return false
}

/*  */

function handleError(err, vm, info) {
    if (vm) {
        let cur = vm;
        while ((cur = cur.$parent)) {
            const hooks = cur.$options.errorCaptured;
            if (hooks) {
                for (let i = 0; i < hooks.length; i++) {
                    try {
                        const capture = hooks[i].call(cur, err, vm, info) === false;
                        if (capture) return
                    } catch (e) {
                        globalHandleError(e, cur, 'errorCaptured hook');
                    }
                }
            }
        }
    }
    globalHandleError(err, vm, info);
}

function globalHandleError(err, vm, info) {
    if (config.errorHandler) {
        try {
            return config.errorHandler.call(null, err, vm, info)
        } catch (e) {
            logError(e, null, 'config.errorHandler');
        }
    }
    logError(err, vm, info);
}

function logError(err, vm, info) {
    {
        warn(`Error in ${info}: "${err.toString()}"`, vm);
    }
    /* istanbul ignore else */
    if ((inBrowser || inWeex) && typeof console !== 'undefined') {
        console.error(err);
    } else {
        throw err
    }
}

/*  */
/* globals MessageChannel */

const callbacks = [];
let pending = false;

function flushCallbacks() {
    pending = false;
    const copies = callbacks.slice(0);
    callbacks.length = 0;
    for (let i = 0; i < copies.length; i++) {
        copies[i]();
    }
}

// Here we have async deferring wrappers using both micro and macro tasks.
// In < 2.4 we used micro tasks everywhere, but there are some scenarios where
// micro tasks have too high a priority and fires in between supposedly
// sequential events (e.g. #4521, #6690) or even between bubbling of the same
// event (#6566). However, using macro tasks everywhere also has subtle problems
// when state is changed right before repaint (e.g. #6813, out-in transitions).
// Here we use micro task by default, but expose a way to force macro task when
// needed (e.g. in event handlers attached by v-on).
let microTimerFunc;
let macroTimerFunc;
let useMacroTask = false;

// Determine (macro) Task defer implementation.
// Technically setImmediate should be the ideal choice, but it's only available
// in IE. The only polyfill that consistently queues the callback after all DOM
// events triggered in the same loop is by using MessageChannel.
/* istanbul ignore if */
if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) {
    macroTimerFunc = () =
>
    {
        setImmediate(flushCallbacks);
    }
    ;
} else if (typeof MessageChannel !== 'undefined' && (
    isNative(MessageChannel) ||
    // PhantomJS
    MessageChannel.toString() === '[object MessageChannelConstructor]'
)) {
    const channel = new MessageChannel();
    const port = channel.port2;
    channel.port1.onmessage = flushCallbacks;
    macroTimerFunc = () =
>
    {
        port.postMessage(1);
    }
    ;
} else {
    /* istanbul ignore next */
    macroTimerFunc = () =
>
    {
        setTimeout(flushCallbacks, 0);
    }
    ;
}

// Determine MicroTask defer implementation.
/* istanbul ignore next, $flow-disable-line */
if (typeof Promise !== 'undefined' && isNative(Promise)) {
    const p = Promise.resolve();
    microTimerFunc = () =
>
    {
        p.then(flushCallbacks);
        // in problematic UIWebViews, Promise.then doesn't completely break, but
        // it can get stuck in a weird state where callbacks are pushed into the
        // microtask queue but the queue isn't being flushed, until the browser
        // needs to do some other work, e.g. handle a timer. Therefore we can
        // "force" the microtask queue to be flushed by adding an empty timer.
        if (isIOS) setTimeout(noop);
    }
    ;
} else {
    // fallback to macro
    microTimerFunc = macroTimerFunc;
}

/**
 * Wrap a function so that if any code inside triggers state change,
 * the changes are queued using a Task instead of a MicroTask.
 */
function withMacroTask(fn) {
    return fn._withTask || (fn._withTask = function () {
        useMacroTask = true;
        const res = fn.apply(null, arguments);
        useMacroTask = false;
        return res
    })
}

function nextTick(cb, ctx) {
    let _resolve;
    callbacks.push(() = > {
        if(cb) {
            try {
                cb.call(ctx);
            } catch (e) {
                handleError(e, ctx, 'nextTick');
            }
        } else if(_resolve) {
            _resolve(ctx);
        }
    }
)
    ;
    if (!pending) {
        pending = true;
        if (useMacroTask) {
            macroTimerFunc();
        } else {
            microTimerFunc();
        }
    }
    // $flow-disable-line
    if (!cb && typeof Promise !== 'undefined') {
        return new Promise(resolve = > {
            _resolve = resolve;
    })
    }
}

/*  */

let mark;
let measure;

{
    const perf = inBrowser && window.performance;
    /* istanbul ignore if */
    if (
        perf &&
        perf.mark &&
        perf.measure &&
        perf.clearMarks &&
        perf.clearMeasures
    ) {
        mark = tag =
    >
        perf.mark(tag);
        measure = (name, startTag, endTag) =
    >
        {
            perf.measure(name, startTag, endTag);
            perf.clearMarks(startTag);
            perf.clearMarks(endTag);
            perf.clearMeasures(name);
        }
        ;
    }
}

/* not type checking this file because flow doesn't play well with Proxy */

let initProxy;

{
    const allowedGlobals = makeMap(
        'Infinity,undefined,NaN,isFinite,isNaN,' +
        'parseFloat,parseInt,decodeURI,decodeURIComponent,encodeURI,encodeURIComponent,' +
        'Math,Number,Date,Array,Object,Boolean,String,RegExp,Map,Set,JSON,Intl,' +
        'require' // for Webpack/Browserify
    );

    const warnNonPresent = (target, key) =
>
    {
        warn(
            `Property or method "${key}" is not defined on the instance but ` +
            'referenced during render. Make sure that this property is reactive, ' +
            'either in the data option, or for class-based components, by ' +
            'initializing the property. ' +
            'See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.',
            target
        );
    }
    ;

    const hasProxy =
        typeof Proxy !== 'undefined' &&
        Proxy.toString().match(/native code/);

    if (hasProxy) {
        const isBuiltInModifier = makeMap('stop,prevent,self,ctrl,shift,alt,meta,exact');
        config.keyCodes = new Proxy(config.keyCodes, {
            set(target, key, value) {
                if (isBuiltInModifier(key)) {
                    warn(`Avoid overwriting built-in modifier in config.keyCodes: .${key}`);
                    return false
                } else {
                    target[key] = value;
                    return true
                }
            }
        });
    }

    const hasHandler = {
        has(target, key) {
            const has = key in target;
            const isAllowed = allowedGlobals(key) || key.charAt(0) === '_';
            if (!has && !isAllowed) {
                warnNonPresent(target, key);
            }
            return has || !isAllowed
        }
    };

    const getHandler = {
        get(target, key) {
            if (typeof key === 'string' && !(key in target)) {
                warnNonPresent(target, key);
            }
            return target[key]
        }
    };

    initProxy = function initProxy(vm) {
        if (hasProxy) {
            // determine which proxy handler to use
            const options = vm.$options;
            const handlers = options.render && options.render._withStripped
                ? getHandler
                : hasHandler;
            vm._renderProxy = new Proxy(vm, handlers);
        } else {
            vm._renderProxy = vm;
        }
    };
}

/*  */

const seenObjects = new _Set();

/**
 * Recursively traverse an object to evoke all converted
 * getters, so that every nested property inside the object
 * is collected as a "deep" dependency.
 */
function traverse(val) {
    _traverse(val, seenObjects);
    seenObjects.clear();
}

function _traverse(val, seen) {
    let i, keys;
    const isA = Array.isArray(val);
    if ((!isA && !isObject(val)) || Object.isFrozen(val)) {
        return
    }
    if (val.__ob__) {
        const depId = val.__ob__.dep.id;
        if (seen.has(depId)) {
            return
        }
        seen.add(depId);
    }
    if (isA) {
        i = val.length;
        while (i--) _traverse(val[i], seen);
    } else {
        keys = Object.keys(val);
        i = keys.length;
        while (i--) _traverse(val[keys[i]], seen);
    }
}

/*  */

const normalizeEvent = cached((name) = > {
    const passive = name.charAt(0) === '&';
name = passive ? name.slice(1) : name;
const once$$1 = name.charAt(0) === '~'; // Prefixed last, checked first
name = once$$1 ? name.slice(1) : name;
const capture = name.charAt(0) === '!';
name = capture ? name.slice(1) : name;
return {
    name,
    once: once$$1,
    capture,
    passive
}
})
;

function createFnInvoker(fns) {
    function invoker() {
        const fns = invoker.fns;
        if (Array.isArray(fns)) {
            const cloned = fns.slice();
            for (let i = 0; i < cloned.length; i++) {
                cloned[i].apply(null, arguments);
            }
        } else {
            // return handler return value for single handlers
            return fns.apply(null, arguments)
        }
    }

    invoker.fns = fns;
    return invoker
}

function updateListeners(
    on,
    oldOn,
    add,
    remove$$1,
    vm
) {
    let name, cur, old, event;
    for (name in on) {
        cur = on[name];
        old = oldOn[name];
        event = normalizeEvent(name);
        if (isUndef(cur)) {
            "development" !== 'production' && warn(
                `Invalid handler for event "${event.name}": got ` + String(cur),
                vm
            );
        } else if (isUndef(old)) {
            if (isUndef(cur.fns)) {
                cur = on[name] = createFnInvoker(cur);
            }
            add(event.name, cur, event.once, event.capture, event.passive);
        } else if (cur !== old) {
            old.fns = cur;
            on[name] = old;
        }
    }
    for (name in oldOn) {
        if (isUndef(on[name])) {
            event = normalizeEvent(name);
            remove$$1(event.name, oldOn[name], event.capture);
        }
    }
}

/*  */

function mergeVNodeHook(def, hookKey, hook) {
    if (def instanceof VNode) {
        def = def.data.hook || (def.data.hook = {});
    }
    let invoker;
    const oldHook = def[hookKey];

    function wrappedHook() {
        hook.apply(this, arguments);
        // important: remove merged hook to ensure it's called only once
        // and prevent memory leak
        remove(invoker.fns, wrappedHook);
    }

    if (isUndef(oldHook)) {
        // no existing hook
        invoker = createFnInvoker([wrappedHook]);
    } else {
        /* istanbul ignore if */
        if (isDef(oldHook.fns) && isTrue(oldHook.merged)) {
            // already a merged invoker
            invoker = oldHook;
            invoker.fns.push(wrappedHook);
        } else {
            // existing plain hook
            invoker = createFnInvoker([oldHook, wrappedHook]);
        }
    }

    invoker.merged = true;
    def[hookKey] = invoker;
}

/*  */

function extractPropsFromVNodeData(
    data,
    Ctor,
    tag
) {
    // we are only extracting raw values here.
    // validation and default values are handled in the child
    // component itself.
    const propOptions = Ctor.options.props;
    if (isUndef(propOptions)) {
        return
    }
    const res = {};
    const {attrs, props} = data;
    if (isDef(attrs) || isDef(props)) {
        for (const key in propOptions) {
            const altKey = hyphenate(key);
            {
                const keyInLowerCase = key.toLowerCase();
                if (
                    key !== keyInLowerCase &&
                    attrs && hasOwn(attrs, keyInLowerCase)
                ) {
                    tip(
                        `Prop "${keyInLowerCase}" is passed to component ` +
                        `${formatComponentName(tag || Ctor)}, but the declared prop name is` +
                        ` "${key}". ` +
                        `Note that HTML attributes are case-insensitive and camelCased ` +
                        `props need to use their kebab-case equivalents when using in-DOM ` +
                        `templates. You should probably use "${altKey}" instead of "${key}".`
                    );
                }
            }
            checkProp(res, props, key, altKey, true) ||
            checkProp(res, attrs, key, altKey, false);
        }
    }
    return res
}

function checkProp(
    res,
    hash,
    key,
    altKey,
    preserve
) {
    if (isDef(hash)) {
        if (hasOwn(hash, key)) {
            res[key] = hash[key];
            if (!preserve) {
                delete hash[key];
            }
            return true
        } else if (hasOwn(hash, altKey)) {
            res[key] = hash[altKey];
            if (!preserve) {
                delete hash[altKey];
            }
            return true
        }
    }
    return false
}

/*  */

// The template compiler attempts to minimize the need for normalization by
// statically analyzing the template at compile time.
//
// For plain HTML markup, normalization can be completely skipped because the
// generated render function is guaranteed to return Array<VNode>. There are
// two cases where extra normalization is needed:

// 1. When the children contains components - because a functional component
// may return an Array instead of a single root. In this case, just a simple
// normalization is needed - if any child is an Array, we flatten the whole
// thing with Array.prototype.concat. It is guaranteed to be only 1-level deep
// because functional components already normalize their own children.
function simpleNormalizeChildren(children) {
    for (let i = 0; i < children.length; i++) {
        if (Array.isArray(children[i])) {
            return Array.prototype.concat.apply([], children)
        }
    }
    return children
}

// 2. When the children contains constructs that always generated nested Arrays,
// e.g. <template>, <slot>, v-for, or when the children is provided by user
// with hand-written render functions / JSX. In such cases a full normalization
// is needed to cater to all possible types of children values.
function normalizeChildren(children) {
    return isPrimitive(children)
        ? [createTextVNode(children)]
        : Array.isArray(children)
            ? normalizeArrayChildren(children)
            : undefined
}

function isTextNode(node) {
    return isDef(node) && isDef(node.text) && isFalse(node.isComment)
}

function normalizeArrayChildren(children, nestedIndex) {
    const res = [];
    let i, c, lastIndex, last;
    for (i = 0; i < children.length; i++) {
        c = children[i];
        if (isUndef(c) || typeof c === 'boolean') continue
        lastIndex = res.length - 1;
        last = res[lastIndex];
        //  nested
        if (Array.isArray(c)) {
            if (c.length > 0) {
                c = normalizeArrayChildren(c, `${nestedIndex || ''}_${i}`);
                // merge adjacent text nodes
                if (isTextNode(c[0]) && isTextNode(last)) {
                    res[lastIndex] = createTextVNode(last.text + (c[0]).text);
                    c.shift();
                }
                res.push.apply(res, c);
            }
        } else if (isPrimitive(c)) {
            if (isTextNode(last)) {
                // merge adjacent text nodes
                // this is necessary for SSR hydration because text nodes are
                // essentially merged when rendered to HTML strings
                res[lastIndex] = createTextVNode(last.text + c);
            } else if (c !== '') {
                // convert primitive to vnode
                res.push(createTextVNode(c));
            }
        } else {
            if (isTextNode(c) && isTextNode(last)) {
                // merge adjacent text nodes
                res[lastIndex] = createTextVNode(last.text + c.text);
            } else {
                // default key for nested array children (likely generated by v-for)
                if (isTrue(children._isVList) &&
                    isDef(c.tag) &&
                    isUndef(c.key) &&
                    isDef(nestedIndex)) {
                    c.key = `__vlist${nestedIndex}_${i}__`;
                }
                res.push(c);
            }
        }
    }
    return res
}

/*  */

function ensureCtor(comp, base) {
    if (
        comp.__esModule ||
        (hasSymbol && comp[Symbol.toStringTag] === 'Module')
    ) {
        comp = comp.default;
    }
    return isObject(comp)
        ? base.extend(comp)
        : comp
}

function createAsyncPlaceholder(
    factory,
    data,
    context,
    children,
    tag
) {
    const node = createEmptyVNode();
    node.asyncFactory = factory;
    node.asyncMeta = {data, context, children, tag};
    return node
}

function resolveAsyncComponent(
    factory,
    baseCtor,
    context
) {
    if (isTrue(factory.error) && isDef(factory.errorComp)) {
        return factory.errorComp
    }

    if (isDef(factory.resolved)) {
        return factory.resolved
    }

    if (isTrue(factory.loading) && isDef(factory.loadingComp)) {
        return factory.loadingComp
    }

    if (isDef(factory.contexts)) {
        // already pending
        factory.contexts.push(context);
    } else {
        const contexts = factory.contexts = [context];
        let sync = true;

        const forceRender = () =
    >
        {
            for (let i = 0, l = contexts.length; i < l; i++) {
                contexts[i].$forceUpdate();
            }
        }
        ;

        const resolve = once((res) = > {
            // cache resolved
            factory.resolved = ensureCtor(res, baseCtor);
        // invoke callbacks only if this is not a synchronous resolve
        // (async resolves are shimmed as synchronous during SSR)
        if (!sync) {
            forceRender();
        }
    })
        ;

        const reject = once(reason = > {
            "development" !== 'production' && warn(
            `Failed to resolve async component: ${String(factory)}` +
            (reason ? `\nReason: ${reason}` : '')
        );
        if (isDef(factory.errorComp)) {
            factory.error = true;
            forceRender();
        }
    })
        ;

        const res = factory(resolve, reject);

        if (isObject(res)) {
            if (typeof res.then === 'function') {
                // () => Promise
                if (isUndef(factory.resolved)) {
                    res.then(resolve, reject);
                }
            } else if (isDef(res.component) && typeof res.component.then === 'function') {
                res.component.then(resolve, reject);

                if (isDef(res.error)) {
                    factory.errorComp = ensureCtor(res.error, baseCtor);
                }

                if (isDef(res.loading)) {
                    factory.loadingComp = ensureCtor(res.loading, baseCtor);
                    if (res.delay === 0) {
                        factory.loading = true;
                    } else {
                        setTimeout(() = > {
                            if(isUndef(factory.resolved) && isUndef(factory.error)
                    )
                        {
                            factory.loading = true;
                            forceRender();
                        }
                    },
                        res.delay || 200
                    )
                        ;
                    }
                }

                if (isDef(res.timeout)) {
                    setTimeout(() = > {
                        if(isUndef(factory.resolved)
                )
                    {
                        reject(
                            `timeout (${res.timeout}ms)`
                        );
                    }
                },
                    res.timeout
                )
                    ;
                }
            }
        }

        sync = false;
        // return in case resolved synchronously
        return factory.loading
            ? factory.loadingComp
            : factory.resolved
    }
}

/*  */

function isAsyncPlaceholder(node) {
    return node.isComment && node.asyncFactory
}

/*  */

function getFirstComponentChild(children) {
    if (Array.isArray(children)) {
        for (let i = 0; i < children.length; i++) {
            const c = children[i];
            if (isDef(c) && (isDef(c.componentOptions) || isAsyncPlaceholder(c))) {
                return c
            }
        }
    }
}

/*  */

/*  */

function initEvents(vm) {
    vm._events = Object.create(null);
    vm._hasHookEvent = false;
    // init parent attached events
    const listeners = vm.$options._parentListeners;
    if (listeners) {
        updateComponentListeners(vm, listeners);
    }
}

let target;

function add(event, fn, once) {
    if (once) {
        target.$once(event, fn);
    } else {
        target.$on(event, fn);
    }
}

function remove$1(event, fn) {
    target.$off(event, fn);
}

function updateComponentListeners(
    vm,
    listeners,
    oldListeners
) {
    target = vm;
    updateListeners(listeners, oldListeners || {}, add, remove$1, vm);
    target = undefined;
}

function eventsMixin(Vue) {
    const hookRE = /^hook:/;
    Vue.prototype.$on = function (event, fn) {
        const vm = this;
        if (Array.isArray(event)) {
            for (let i = 0, l = event.length; i < l; i++) {
                this.$on(event[i], fn);
            }
        } else {
            (vm._events[event] || (vm._events[event] = [])).push(fn);
            // optimize hook:event cost by using a boolean flag marked at registration
            // instead of a hash lookup
            if (hookRE.test(event)) {
                vm._hasHookEvent = true;
            }
        }
        return vm
    };

    Vue.prototype.$once = function (event, fn) {
        const vm = this;

        function on() {
            vm.$off(event, on);
            fn.apply(vm, arguments);
        }

        on.fn = fn;
        vm.$on(event, on);
        return vm
    };

    Vue.prototype.$off = function (event, fn) {
        const vm = this;
        // all
        if (!arguments.length) {
            vm._events = Object.create(null);
            return vm
        }
        // array of events
        if (Array.isArray(event)) {
            for (let i = 0, l = event.length; i < l; i++) {
                this.$off(event[i], fn);
            }
            return vm
        }
        // specific event
        const cbs = vm._events[event];
        if (!cbs) {
            return vm
        }
        if (!fn) {
            vm._events[event] = null;
            return vm
        }
        if (fn) {
            // specific handler
            let cb;
            let i = cbs.length;
            while (i--) {
                cb = cbs[i];
                if (cb === fn || cb.fn === fn) {
                    cbs.splice(i, 1);
                    break
                }
            }
        }
        return vm
    };

    Vue.prototype.$emit = function (event) {
        const vm = this;
        {
            const lowerCaseEvent = event.toLowerCase();
            if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
                tip(
                    `Event "${lowerCaseEvent}" is emitted in component ` +
                    `${formatComponentName(vm)} but the handler is registered for "${event}". ` +
                    `Note that HTML attributes are case-insensitive and you cannot use ` +
                    `v-on to listen to camelCase events when using in-DOM templates. ` +
                    `You should probably use "${hyphenate(event)}" instead of "${event}".`
                );
            }
        }
        let cbs = vm._events[event];
        if (cbs) {
            cbs = cbs.length > 1 ? toArray(cbs) : cbs;
            const args = toArray(arguments, 1);
            for (let i = 0, l = cbs.length; i < l; i++) {
                try {
                    cbs[i].apply(vm, args);
                } catch (e) {
                    handleError(e, vm, `event handler for "${event}"`);
                }
            }
        }
        return vm
    };
}

/*  */

/**
 * Runtime helper for resolving raw children VNodes into a slot object.
 */
function resolveSlots(
    children,
    context
) {
    const slots = {};
    if (!children) {
        return slots
    }
    for (let i = 0, l = children.length; i < l; i++) {
        const child = children[i];
        const data = child.data;
        // remove slot attribute if the node is resolved as a Vue slot node
        if (data && data.attrs && data.attrs.slot) {
            delete data.attrs.slot;
        }
        // named slots should only be respected if the vnode was rendered in the
        // same context.
        if ((child.context === context || child.functionalContext === context) &&
            data && data.slot != null
        ) {
            const name = child.data.slot;
            const slot = (slots[name] || (slots[name] = []));
            if (child.tag === 'template') {
                slot.push.apply(slot, child.children);
            } else {
                slot.push(child);
            }
        } else {
            (slots.default || (slots.default = [])).push(child);
        }
    }
    // ignore slots that contains only whitespace
    for (const name in slots) {
        if (slots[name].every(isWhitespace)) {
            delete slots[name];
        }
    }
    return slots
}

function isWhitespace(node) {
    return (node.isComment && !node.asyncFactory) || node.text === ' '
}

function resolveScopedSlots(
    fns, // see flow/vnode
    res
) {
    res = res || {};
    for (let i = 0; i < fns.length; i++) {
        if (Array.isArray(fns[i])) {
            resolveScopedSlots(fns[i], res);
        } else {
            res[fns[i].key] = fns[i].fn;
        }
    }
    return res
}

/*  */

let activeInstance = null;
let isUpdatingChildComponent = false;

function initLifecycle(vm) {
    const options = vm.$options;

    // locate first non-abstract parent
    let parent = options.parent;
    if (parent && !options.abstract) {
        while (parent.$options.abstract && parent.$parent) {
            parent = parent.$parent;
        }
        parent.$children.push(vm);
    }

    vm.$parent = parent;
    vm.$root = parent ? parent.$root : vm;

    vm.$children = [];
    vm.$refs = {};

    vm._watcher = null;
    vm._inactive = null;
    vm._directInactive = false;
    vm._isMounted = false;
    vm._isDestroyed = false;
    vm._isBeingDestroyed = false;
}

function lifecycleMixin(Vue) {
    Vue.prototype._update = function (vnode, hydrating) {
        const vm = this;
        if (vm._isMounted) {
            callHook(vm, 'beforeUpdate');
        }
        const prevEl = vm.$el;
        const prevVnode = vm._vnode;
        const prevActiveInstance = activeInstance;
        activeInstance = vm;
        vm._vnode = vnode;
        // Vue.prototype.__patch__ is injected in entry points
        // based on the rendering backend used.
        if (!prevVnode) {
            // initial render
            vm.$el = vm.__patch__(
                vm.$el, vnode, hydrating, false /* removeOnly */,
                vm.$options._parentElm,
                vm.$options._refElm
            );
            // no need for the ref nodes after initial patch
            // this prevents keeping a detached DOM tree in memory (#5851)
            vm.$options._parentElm = vm.$options._refElm = null;
        } else {
            // updates
            vm.$el = vm.__patch__(prevVnode, vnode);
        }
        activeInstance = prevActiveInstance;
        // update __vue__ reference
        if (prevEl) {
            prevEl.__vue__ = null;
        }
        if (vm.$el) {
            vm.$el.__vue__ = vm;
        }
        // if parent is an HOC, update its $el as well
        if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
            vm.$parent.$el = vm.$el;
        }
        // updated hook is called by the scheduler to ensure that children are
        // updated in a parent's updated hook.
    };

    Vue.prototype.$forceUpdate = function () {
        const vm = this;
        if (vm._watcher) {
            vm._watcher.update();
        }
    };

    Vue.prototype.$destroy = function () {
        const vm = this;
        if (vm._isBeingDestroyed) {
            return
        }
        callHook(vm, 'beforeDestroy');
        vm._isBeingDestroyed = true;
        // remove self from parent
        const parent = vm.$parent;
        if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
            remove(parent.$children, vm);
        }
        // teardown watchers
        if (vm._watcher) {
            vm._watcher.teardown();
        }
        let i = vm._watchers.length;
        while (i--) {
            vm._watchers[i].teardown();
        }
        // remove reference from data ob
        // frozen object may not have observer.
        if (vm._data.__ob__) {
            vm._data.__ob__.vmCount--;
        }
        // call the last hook...
        vm._isDestroyed = true;
        // invoke destroy hooks on current rendered tree
        vm.__patch__(vm._vnode, null);
        // fire destroyed hook
        callHook(vm, 'destroyed');
        // turn off all instance listeners.
        vm.$off();
        // remove __vue__ reference
        if (vm.$el) {
            vm.$el.__vue__ = null;
        }
        // release circular reference (#6759)
        if (vm.$vnode) {
            vm.$vnode.parent = null;
        }
    };
}

function mountComponent(
    vm,
    el,
    hydrating
) {
    vm.$el = el;
    if (!vm.$options.render) {
        vm.$options.render = createEmptyVNode;
        {
            /* istanbul ignore if */
            if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
                vm.$options.el || el) {
                warn(
                    'You are using the runtime-only build of Vue where the template ' +
                    'compiler is not available. Either pre-compile the templates into ' +
                    'render functions, or use the compiler-included build.',
                    vm
                );
            } else {
                warn(
                    'Failed to mount component: template or render function not defined.',
                    vm
                );
            }
        }
    }
    callHook(vm, 'beforeMount');

    let updateComponent;
    /* istanbul ignore if */
    if ("development" !== 'production' && config.performance && mark) {
        updateComponent = () =
    >
        {
            const name = vm._name;
            const id = vm._uid;
            const startTag = `vue-perf-start:${id}`;
            const endTag = `vue-perf-end:${id}`;

            mark(startTag);
            const vnode = vm._render();
            mark(endTag);
            measure(`vue ${name} render`, startTag, endTag);

            mark(startTag);
            vm._update(vnode, hydrating);
            mark(endTag);
            measure(`vue ${name} patch`, startTag, endTag);
        }
        ;
    } else {
        updateComponent = () =
    >
        {
            vm._update(vm._render(), hydrating);
        }
        ;
    }

    vm._watcher = new Watcher(vm, updateComponent, noop);
    hydrating = false;

    // manually mounted instance, call mounted on self
    // mounted is called for render-created child components in its inserted hook
    if (vm.$vnode == null) {
        vm._isMounted = true;
        callHook(vm, 'mounted');
    }
    return vm
}

function updateChildComponent(
    vm,
    propsData,
    listeners,
    parentVnode,
    renderChildren
) {
    {
        isUpdatingChildComponent = true;
    }

    // determine whether component has slot children
    // we need to do this before overwriting $options._renderChildren
    const hasChildren = !!(
        renderChildren ||               // has new static slots
        vm.$options._renderChildren ||  // has old static slots
        parentVnode.data.scopedSlots || // has new scoped slots
        vm.$scopedSlots !== emptyObject // has old scoped slots
    );

    vm.$options._parentVnode = parentVnode;
    vm.$vnode = parentVnode; // update vm's placeholder node without re-render

    if (vm._vnode) { // update child tree's parent
        vm._vnode.parent = parentVnode;
    }
    vm.$options._renderChildren = renderChildren;

    // update $attrs and $listeners hash
    // these are also reactive so they may trigger child update if the child
    // used them during render
    vm.$attrs = (parentVnode.data && parentVnode.data.attrs) || emptyObject;
    vm.$listeners = listeners || emptyObject;

    // update props
    if (propsData && vm.$options.props) {
        observerState.shouldConvert = false;
        const props = vm._props;
        const propKeys = vm.$options._propKeys || [];
        for (let i = 0; i < propKeys.length; i++) {
            const key = propKeys[i];
            props[key] = validateProp(key, vm.$options.props, propsData, vm);
        }
        observerState.shouldConvert = true;
        // keep a copy of raw propsData
        vm.$options.propsData = propsData;
    }

    // update listeners
    if (listeners) {
        const oldListeners = vm.$options._parentListeners;
        vm.$options._parentListeners = listeners;
        updateComponentListeners(vm, listeners, oldListeners);
    }
    // resolve slots + force update if has children
    if (hasChildren) {
        vm.$slots = resolveSlots(renderChildren, parentVnode.context);
        vm.$forceUpdate();
    }

    {
        isUpdatingChildComponent = false;
    }
}

function isInInactiveTree(vm) {
    while (vm && (vm = vm.$parent)) {
        if (vm._inactive) return true
    }
    return false
}

function activateChildComponent(vm, direct) {
    if (direct) {
        vm._directInactive = false;
        if (isInInactiveTree(vm)) {
            return
        }
    } else if (vm._directInactive) {
        return
    }
    if (vm._inactive || vm._inactive === null) {
        vm._inactive = false;
        for (let i = 0; i < vm.$children.length; i++) {
            activateChildComponent(vm.$children[i]);
        }
        callHook(vm, 'activated');
    }
}

function deactivateChildComponent(vm, direct) {
    if (direct) {
        vm._directInactive = true;
        if (isInInactiveTree(vm)) {
            return
        }
    }
    if (!vm._inactive) {
        vm._inactive = true;
        for (let i = 0; i < vm.$children.length; i++) {
            deactivateChildComponent(vm.$children[i]);
        }
        callHook(vm, 'deactivated');
    }
}

function callHook(vm, hook) {
    const handlers = vm.$options[hook];
    if (handlers) {
        for (let i = 0, j = handlers.length; i < j; i++) {
            try {
                handlers[i].call(vm);
            } catch (e) {
                handleError(e, vm, `${hook} hook`);
            }
        }
    }
    if (vm._hasHookEvent) {
        vm.$emit('hook:' + hook);
    }
}

/*  */


const MAX_UPDATE_COUNT = 100;

const queue = [];
const activatedChildren = [];
let has = {};
let circular = {};
let waiting = false;
let flushing = false;
let index = 0;

/**
 * Reset the scheduler's state.
 */
function resetSchedulerState() {
    index = queue.length = activatedChildren.length = 0;
    has = {};
    {
        circular = {};
    }
    waiting = flushing = false;
}

/**
 * Flush both queues and run the watchers.
 */
function flushSchedulerQueue() {
    flushing = true;
    let watcher, id;

    // Sort queue before flush.
    // This ensures that:
    // 1. Components are updated from parent to child. (because parent is always
    //    created before the child)
    // 2. A component's user watchers are run before its render watcher (because
    //    user watchers are created before the render watcher)
    // 3. If a component is destroyed during a parent component's watcher run,
    //    its watchers can be skipped.
    queue.sort((a, b) = > a.id - b.id
)
    ;

    // do not cache length because more watchers might be pushed
    // as we run existing watchers
    for (index = 0; index < queue.length; index++) {
        watcher = queue[index];
        id = watcher.id;
        has[id] = null;
        watcher.run();
        // in dev build, check and stop circular updates.
        if ("development" !== 'production' && has[id] != null) {
            circular[id] = (circular[id] || 0) + 1;
            if (circular[id] > MAX_UPDATE_COUNT) {
                warn(
                    'You may have an infinite update loop ' + (
                        watcher.user
                            ? `in watcher with expression "${watcher.expression}"`
                            : `in a component render function.`
                    ),
                    watcher.vm
                );
                break
            }
        }
    }

    // keep copies of post queues before resetting state
    const activatedQueue = activatedChildren.slice();
    const updatedQueue = queue.slice();

    resetSchedulerState();

    // call component updated and activated hooks
    callActivatedHooks(activatedQueue);
    callUpdatedHooks(updatedQueue);

    // devtool hook
    /* istanbul ignore if */
    if (devtools && config.devtools) {
        devtools.emit('flush');
    }
}

function callUpdatedHooks(queue) {
    let i = queue.length;
    while (i--) {
        const watcher = queue[i];
        const vm = watcher.vm;
        if (vm._watcher === watcher && vm._isMounted) {
            callHook(vm, 'updated');
        }
    }
}

/**
 * Queue a kept-alive component that was activated during patch.
 * The queue will be processed after the entire tree has been patched.
 */
function queueActivatedComponent(vm) {
    // setting _inactive to false here so that a render function can
    // rely on checking whether it's in an inactive tree (e.g. router-view)
    vm._inactive = false;
    activatedChildren.push(vm);
}

function callActivatedHooks(queue) {
    for (let i = 0; i < queue.length; i++) {
        queue[i]._inactive = true;
        activateChildComponent(queue[i], true /* true */);
    }
}

/**
 * Push a watcher into the watcher queue.
 * Jobs with duplicate IDs will be skipped unless it's
 * pushed when the queue is being flushed.
 */
function queueWatcher(watcher) {
    const id = watcher.id;
    if (has[id] == null) {
        has[id] = true;
        if (!flushing) {
            queue.push(watcher);
        } else {
            // if already flushing, splice the watcher based on its id
            // if already past its id, it will be run next immediately.
            let i = queue.length - 1;
            while (i > index && queue[i].id > watcher.id) {
                i--;
            }
            queue.splice(i + 1, 0, watcher);
        }
        // queue the flush
        if (!waiting) {
            waiting = true;
            nextTick(flushSchedulerQueue);
        }
    }
}

/*  */

let uid$2 = 0;

/**
 * A watcher parses an expression, collects dependencies,
 * and fires callback when the expression value changes.
 * This is used for both the $watch() api and directives.
 */
class Watcher {


    constructor(
        vm,
        expOrFn,
        cb,
        options
    ) {
        this.vm = vm;
        vm._watchers.push(this);
        // options
        if (options) {
            this.deep = !!options.deep;
            this.user = !!options.user;
            this.lazy = !!options.lazy;
            this.sync = !!options.sync;
        } else {
            this.deep = this.user = this.lazy = this.sync = false;
        }
        this.cb = cb;
        this.id = ++uid$2; // uid for batching
        this.active = true;
        this.dirty = this.lazy; // for lazy watchers
        this.deps = [];
        this.newDeps = [];
        this.depIds = new _Set();
        this.newDepIds = new _Set();
        this.expression = expOrFn.toString();
        // parse expression for getter
        if (typeof expOrFn === 'function') {
            this.getter = expOrFn;
        } else {
            this.getter = parsePath(expOrFn);
            if (!this.getter) {
                this.getter = function () {
                };
                "development" !== 'production' && warn(
                    `Failed watching path: "${expOrFn}" ` +
                    'Watcher only accepts simple dot-delimited paths. ' +
                    'For full control, use a function instead.',
                    vm
                );
            }
        }
        this.value = this.lazy
            ? undefined
            : this.get();
    }

    /**
     * Evaluate the getter, and re-collect dependencies.
     */
    get() {
        pushTarget(this);
        let value;
        const vm = this.vm;
        try {
            value = this.getter.call(vm, vm);
        } catch (e) {
            if (this.user) {
                handleError(e, vm, `getter for watcher "${this.expression}"`);
            } else {
                throw e
            }
        } finally {
            // "touch" every property so they are all tracked as
            // dependencies for deep watching
            if (this.deep) {
                traverse(value);
            }
            popTarget();
            this.cleanupDeps();
        }
        return value
    }

    /**
     * Add a dependency to this directive.
     */
    addDep(dep) {
        const id = dep.id;
        if (!this.newDepIds.has(id)) {
            this.newDepIds.add(id);
            this.newDeps.push(dep);
            if (!this.depIds.has(id)) {
                dep.addSub(this);
            }
        }
    }

    /**
     * Clean up for dependency collection.
     */
    cleanupDeps() {
        let i = this.deps.length;
        while (i--) {
            const dep = this.deps[i];
            if (!this.newDepIds.has(dep.id)) {
                dep.removeSub(this);
            }
        }
        let tmp = this.depIds;
        this.depIds = this.newDepIds;
        this.newDepIds = tmp;
        this.newDepIds.clear();
        tmp = this.deps;
        this.deps = this.newDeps;
        this.newDeps = tmp;
        this.newDeps.length = 0;
    }

    /**
     * Subscriber interface.
     * Will be called when a dependency changes.
     */
    update() {
        /* istanbul ignore else */
        if (this.lazy) {
            this.dirty = true;
        } else if (this.sync) {
            this.run();
        } else {
            queueWatcher(this);
        }
    }

    /**
     * Scheduler job interface.
     * Will be called by the scheduler.
     */
    run() {
        if (this.active) {
            const value = this.get();
            if (
                value !== this.value ||
                // Deep watchers and watchers on Object/Arrays should fire even
                // when the value is the same, because the value may
                // have mutated.
                isObject(value) ||
                this.deep
            ) {
                // set new value
                const oldValue = this.value;
                this.value = value;
                if (this.user) {
                    try {
                        this.cb.call(this.vm, value, oldValue);
                    } catch (e) {
                        handleError(e, this.vm, `callback for watcher "${this.expression}"`);
                    }
                } else {
                    this.cb.call(this.vm, value, oldValue);
                }
            }
        }
    }

    /**
     * Evaluate the value of the watcher.
     * This only gets called for lazy watchers.
     */
    evaluate() {
        this.value = this.get();
        this.dirty = false;
    }

    /**
     * Depend on all deps collected by this watcher.
     */
    depend() {
        let i = this.deps.length;
        while (i--) {
            this.deps[i].depend();
        }
    }

    /**
     * Remove self from all dependencies' subscriber list.
     */
    teardown() {
        if (this.active) {
            // remove self from vm's watcher list
            // this is a somewhat expensive operation so we skip it
            // if the vm is being destroyed.
            if (!this.vm._isBeingDestroyed) {
                remove(this.vm._watchers, this);
            }
            let i = this.deps.length;
            while (i--) {
                this.deps[i].removeSub(this);
            }
            this.active = false;
        }
    }
}

/*  */

const sharedPropertyDefinition = {
    enumerable: true,
    configurable: true,
    get: noop,
    set: noop
};

function proxy(target, sourceKey, key) {
    sharedPropertyDefinition.get = function proxyGetter() {
        return this[sourceKey][key]
    };
    sharedPropertyDefinition.set = function proxySetter(val) {
        this[sourceKey][key] = val;
    };
    Object.defineProperty(target, key, sharedPropertyDefinition);
}

function initState(vm) {
    vm._watchers = [];
    const opts = vm.$options;
    if (opts.props) initProps(vm, opts.props);
    if (opts.methods) initMethods(vm, opts.methods);
    if (opts.data) {
        initData(vm);
    } else {
        observe(vm._data = {}, true /* asRootData */);
    }
    if (opts.computed) initComputed(vm, opts.computed);
    if (opts.watch && opts.watch !== nativeWatch) {
        initWatch(vm, opts.watch);
    }
}

function initProps(vm, propsOptions) {
    const propsData = vm.$options.propsData || {};
    const props = vm._props = {};
    // cache prop keys so that future props updates can iterate using Array
    // instead of dynamic object key enumeration.
    const keys = vm.$options._propKeys = [];
    const isRoot = !vm.$parent;
    // root instance props should be converted
    observerState.shouldConvert = isRoot;
    for (const key in propsOptions) {
        keys.push(key);
        const value = validateProp(key, propsOptions, propsData, vm);
        /* istanbul ignore else */
        {
            const hyphenatedKey = hyphenate(key);
            if (isReservedAttribute(hyphenatedKey) ||
                config.isReservedAttr(hyphenatedKey)) {
                warn(
                    `"${hyphenatedKey}" is a reserved attribute and cannot be used as component prop.`,
                    vm
                );
            }
            defineReactive(props, key, value, () = > {
                if(vm.$parent && !isUpdatingChildComponent
        )
            {
                warn(
                    `Avoid mutating a prop directly since the value will be ` +
                    `overwritten whenever the parent component re-renders. ` +
                    `Instead, use a data or computed property based on the prop's ` +
                    `value. Prop being mutated: "${key}"`,
                    vm
                );
            }
        })
            ;
        }
        // static props are already proxied on the component's prototype
        // during Vue.extend(). We only need to proxy props defined at
        // instantiation here.
        if (!(key in vm)) {
            proxy(vm, `_props`, key);
        }
    }
    observerState.shouldConvert = true;
}

function initData(vm) {
    let data = vm.$options.data;
    data = vm._data = typeof data === 'function'
        ? getData(data, vm)
        : data || {};
    if (!isPlainObject(data)) {
        data = {};
        "development" !== 'production' && warn(
            'data functions should return an object:\n' +
            'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
            vm
        );
    }
    // proxy data on instance
    const keys = Object.keys(data);
    const props = vm.$options.props;
    const methods = vm.$options.methods;
    let i = keys.length;
    while (i--) {
        const key = keys[i];
        {
            if (methods && hasOwn(methods, key)) {
                warn(
                    `Method "${key}" has already been defined as a data property.`,
                    vm
                );
            }
        }
        if (props && hasOwn(props, key)) {
            "development" !== 'production' && warn(
                `The data property "${key}" is already declared as a prop. ` +
                `Use prop default value instead.`,
                vm
            );
        } else if (!isReserved(key)) {
            proxy(vm, `_data`, key);
        }
    }
    // observe data
    observe(data, true /* asRootData */);
}

function getData(data, vm) {
    try {
        return data.call(vm, vm)
    } catch (e) {
        handleError(e, vm, `data()`);
        return {}
    }
}

const computedWatcherOptions = {lazy: true};

function initComputed(vm, computed) {
    const watchers = vm._computedWatchers = Object.create(null);
    // computed properties are just getters during SSR
    const isSSR = isServerRendering();

    for (const key in computed) {
        const userDef = computed[key];
        const getter = typeof userDef === 'function' ? userDef : userDef.get;
        if ("development" !== 'production' && getter == null) {
            warn(
                `Getter is missing for computed property "${key}".`,
                vm
            );
        }

        if (!isSSR) {
            // create internal watcher for the computed property.
            watchers[key] = new Watcher(
                vm,
                getter || noop,
                noop,
                computedWatcherOptions
            );
        }

        // component-defined computed properties are already defined on the
        // component prototype. We only need to define computed properties defined
        // at instantiation here.
        if (!(key in vm)) {
            defineComputed(vm, key, userDef);
        } else {
            if (key in vm.$data) {
                warn(`The computed property "${key}" is already defined in data.`, vm);
            } else if (vm.$options.props && key in vm.$options.props) {
                warn(`The computed property "${key}" is already defined as a prop.`, vm);
            }
        }
    }
}

function defineComputed(
    target,
    key,
    userDef
) {
    const shouldCache = !isServerRendering();
    if (typeof userDef === 'function') {
        sharedPropertyDefinition.get = shouldCache
            ? createComputedGetter(key)
            : userDef;
        sharedPropertyDefinition.set = noop;
    } else {
        sharedPropertyDefinition.get = userDef.get
            ? shouldCache && userDef.cache !== false
                ? createComputedGetter(key)
                : userDef.get
            : noop;
        sharedPropertyDefinition.set = userDef.set
            ? userDef.set
            : noop;
    }
    if ("development" !== 'production' &&
        sharedPropertyDefinition.set === noop) {
        sharedPropertyDefinition.set = function () {
            warn(
                `Computed property "${key}" was assigned to but it has no setter.`,
                this
            );
        };
    }
    Object.defineProperty(target, key, sharedPropertyDefinition);
}

function createComputedGetter(key) {
    return function computedGetter() {
        const watcher = this._computedWatchers && this._computedWatchers[key];
        if (watcher) {
            if (watcher.dirty) {
                watcher.evaluate();
            }
            if (Dep.target) {
                watcher.depend();
            }
            return watcher.value
        }
    }
}

function initMethods(vm, methods) {
    const props = vm.$options.props;
    for (const key in methods) {
        {
            if (methods[key] == null) {
                warn(
                    `Method "${key}" has an undefined value in the component definition. ` +
                    `Did you reference the function correctly?`,
                    vm
                );
            }
            if (props && hasOwn(props, key)) {
                warn(
                    `Method "${key}" has already been defined as a prop.`,
                    vm
                );
            }
            if ((key in vm) && isReserved(key)) {
                warn(
                    `Method "${key}" conflicts with an existing Vue instance method. ` +
                    `Avoid defining component methods that start with _ or $.`
                );
            }
        }
        vm[key] = methods[key] == null ? noop : bind(methods[key], vm);
    }
}

function initWatch(vm, watch) {
    for (const key in watch) {
        const handler = watch[key];
        if (Array.isArray(handler)) {
            for (let i = 0; i < handler.length; i++) {
                createWatcher(vm, key, handler[i]);
            }
        } else {
            createWatcher(vm, key, handler);
        }
    }
}

function createWatcher(
    vm,
    keyOrFn,
    handler,
    options
) {
    if (isPlainObject(handler)) {
        options = handler;
        handler = handler.handler;
    }
    if (typeof handler === 'string') {
        handler = vm[handler];
    }
    return vm.$watch(keyOrFn, handler, options)
}

function stateMixin(Vue) {
    // flow somehow has problems with directly declared definition object
    // when using Object.defineProperty, so we have to procedurally build up
    // the object here.
    const dataDef = {};
    dataDef.get = function () {
        return this._data
    };
    const propsDef = {};
    propsDef.get = function () {
        return this._props
    };
    {
        dataDef.set = function (newData) {
            warn(
                'Avoid replacing instance root $data. ' +
                'Use nested data properties instead.',
                this
            );
        };
        propsDef.set = function () {
            warn(`$props is readonly.`, this);
        };
    }
    Object.defineProperty(Vue.prototype, '$data', dataDef);
    Object.defineProperty(Vue.prototype, '$props', propsDef);

    Vue.prototype.$set = set;
    Vue.prototype.$delete = del;

    Vue.prototype.$watch = function (
        expOrFn,
        cb,
        options
    ) {
        const vm = this;
        if (isPlainObject(cb)) {
            return createWatcher(vm, expOrFn, cb, options)
        }
        options = options || {};
        options.user = true;
        const watcher = new Watcher(vm, expOrFn, cb, options);
        if (options.immediate) {
            cb.call(vm, watcher.value);
        }
        return function unwatchFn() {
            watcher.teardown();
        }
    };
}

/*  */

function initProvide(vm) {
    const provide = vm.$options.provide;
    if (provide) {
        vm._provided = typeof provide === 'function'
            ? provide.call(vm)
            : provide;
    }
}

function initInjections(vm) {
    const result = resolveInject(vm.$options.inject, vm);
    if (result) {
        observerState.shouldConvert = false;
        Object.keys(result).forEach(key = > {
        /* istanbul ignore else */
        {
            defineReactive(vm, key, result[key], () = > {
                warn(
                `Avoid mutating an injected value directly since the changes will be ` +
            `overwritten whenever the provided component re-renders. ` +
            `injection being mutated: "${key}"`,
                vm
        )
            ;
        })
            ;
        }
    })
        ;
        observerState.shouldConvert = true;
    }
}

function resolveInject(inject, vm) {
    if (inject) {
        // inject is :any because flow is not smart enough to figure out cached
        const result = Object.create(null);
        const keys = hasSymbol
            ? Reflect.ownKeys(inject).filter(key = > {
            /* istanbul ignore next */
            return Object.getOwnPropertyDescriptor(inject, key).enumerable
        }
    )
    :
        Object.keys(inject);

        for (let i = 0; i < keys.length; i++) {
            const key = keys[i];
            const provideKey = inject[key].from;
            let source = vm;
            while (source) {
                if (source._provided && provideKey in source._provided) {
                    result[key] = source._provided[provideKey];
                    break
                }
                source = source.$parent;
            }
            if (!source) {
                if ('default' in inject[key]) {
                    const provideDefault = inject[key].default;
                    result[key] = typeof provideDefault === 'function'
                        ? provideDefault.call(vm)
                        : provideDefault;
                } else {
                    warn(`Injection "${key}" not found`, vm);
                }
            }
        }
        return result
    }
}

/*  */

/**
 * Runtime helper for rendering v-for lists.
 */
function renderList(
    val,
    render
) {
    let ret, i, l, keys, key;
    if (Array.isArray(val) || typeof val === 'string') {
        ret = new Array(val.length);
        for (i = 0, l = val.length; i < l; i++) {
            ret[i] = render(val[i], i);
        }
    } else if (typeof val === 'number') {
        ret = new Array(val);
        for (i = 0; i < val; i++) {
            ret[i] = render(i + 1, i);
        }
    } else if (isObject(val)) {
        keys = Object.keys(val);
        ret = new Array(keys.length);
        for (i = 0, l = keys.length; i < l; i++) {
            key = keys[i];
            ret[i] = render(val[key], key, i);
        }
    }
    if (isDef(ret)) {
        (ret)._isVList = true;
    }
    return ret
}

/*  */

/**
 * Runtime helper for rendering <slot>
 */
function renderSlot(
    name,
    fallback,
    props,
    bindObject
) {
    const scopedSlotFn = this.$scopedSlots[name];
    let nodes;
    if (scopedSlotFn) { // scoped slot
        props = props || {};
        if (bindObject) {
            if ("development" !== 'production' && !isObject(bindObject)) {
                warn(
                    'slot v-bind without argument expects an Object',
                    this
                );
            }
            props = extend(extend({}, bindObject), props);
        }
        nodes = scopedSlotFn(props) || fallback;
    } else {
        const slotNodes = this.$slots[name];
        // warn duplicate slot usage
        if (slotNodes) {
            if ("development" !== 'production' && slotNodes._rendered) {
                warn(
                    `Duplicate presence of slot "${name}" found in the same render tree ` +
                    `- this will likely cause render errors.`,
                    this
                );
            }
            slotNodes._rendered = true;
        }
        nodes = slotNodes || fallback;
    }

    const target = props && props.slot;
    if (target) {
        return this.$createElement('template', {slot: target}, nodes)
    } else {
        return nodes
    }
}

/*  */

/**
 * Runtime helper for resolving filters
 */
function resolveFilter(id) {
    return resolveAsset(this.$options, 'filters', id, true) || identity
}

/*  */

/**
 * Runtime helper for checking keyCodes from config.
 * exposed as Vue.prototype._k
 * passing in eventKeyName as last argument separately for backwards compat
 */
function checkKeyCodes(
    eventKeyCode,
    key,
    builtInAlias,
    eventKeyName
) {
    const keyCodes = config.keyCodes[key] || builtInAlias;
    if (keyCodes) {
        if (Array.isArray(keyCodes)) {
            return keyCodes.indexOf(eventKeyCode) === -1
        } else {
            return keyCodes !== eventKeyCode
        }
    } else if (eventKeyName) {
        return hyphenate(eventKeyName) !== key
    }
}

/*  */

/**
 * Runtime helper for merging v-bind="object" into a VNode's data.
 */
function bindObjectProps(
    data,
    tag,
    value,
    asProp,
    isSync
) {
    if (value) {
        if (!isObject(value)) {
            "development" !== 'production' && warn(
                'v-bind without argument expects an Object or Array value',
                this
            );
        } else {
            if (Array.isArray(value)) {
                value = toObject(value);
            }
            let hash;
            for (const key in value) {
                if (
                    key === 'class' ||
                    key === 'style' ||
                    isReservedAttribute(key)
                ) {
                    hash = data;
                } else {
                    const type = data.attrs && data.attrs.type;
                    hash = asProp || config.mustUseProp(tag, type, key)
                        ? data.domProps || (data.domProps = {})
                        : data.attrs || (data.attrs = {});
                }
                if (!(key in hash)) {
                    hash[key] = value[key];

                    if (isSync) {
                        const on = data.on || (data.on = {});
                        on[`update:${key}`] = function ($event) {
                            value[key] = $event;
                        };
                    }
                }
            }
        }
    }
    return data
}

/*  */

/**
 * Runtime helper for rendering static trees.
 */
function renderStatic(
    index,
    isInFor,
    isOnce
) {
    // render fns generated by compiler < 2.5.4 does not provide v-once
    // information to runtime so be conservative
    const isOldVersion = arguments.length < 3;
    // if a static tree is generated by v-once, it is cached on the instance;
    // otherwise it is purely static and can be cached on the shared options
    // across all instances.
    const renderFns = this.$options.staticRenderFns;
    const cached = isOldVersion || isOnce
        ? (this._staticTrees || (this._staticTrees = []))
        : (renderFns.cached || (renderFns.cached = []));
    let tree = cached[index];
    // if has already-rendered static tree and not inside v-for,
    // we can reuse the same tree by doing a shallow clone.
    if (tree && !isInFor) {
        return Array.isArray(tree)
            ? cloneVNodes(tree)
            : cloneVNode(tree)
    }
    // otherwise, render a fresh tree.
    tree = cached[index] = renderFns[index].call(this._renderProxy, null, this);
    markStatic(tree, `__static__${index}`, false);
    return tree
}

/**
 * Runtime helper for v-once.
 * Effectively it means marking the node as static with a unique key.
 */
function markOnce(
    tree,
    index,
    key
) {
    markStatic(tree, `__once__${index}${key ? `_${key}` : ``}`, true);
    return tree
}

function markStatic(
    tree,
    key,
    isOnce
) {
    if (Array.isArray(tree)) {
        for (let i = 0; i < tree.length; i++) {
            if (tree[i] && typeof tree[i] !== 'string') {
                markStaticNode(tree[i], `${key}_${i}`, isOnce);
            }
        }
    } else {
        markStaticNode(tree, key, isOnce);
    }
}

function markStaticNode(node, key, isOnce) {
    node.isStatic = true;
    node.key = key;
    node.isOnce = isOnce;
}

/*  */

function bindObjectListeners(data, value) {
    if (value) {
        if (!isPlainObject(value)) {
            "development" !== 'production' && warn(
                'v-on without argument expects an Object value',
                this
            );
        } else {
            const on = data.on = data.on ? extend({}, data.on) : {};
            for (const key in value) {
                const existing = on[key];
                const ours = value[key];
                on[key] = existing ? [].concat(existing, ours) : ours;
            }
        }
    }
    return data
}

/*  */

function installRenderHelpers(target) {
    target._o = markOnce;
    target._n = toNumber;
    target._s = toString;
    target._l = renderList;
    target._t = renderSlot;
    target._q = looseEqual;
    target._i = looseIndexOf;
    target._m = renderStatic;
    target._f = resolveFilter;
    target._k = checkKeyCodes;
    target._b = bindObjectProps;
    target._v = createTextVNode;
    target._e = createEmptyVNode;
    target._u = resolveScopedSlots;
    target._g = bindObjectListeners;
}

/*  */

function FunctionalRenderContext(
    data,
    props,
    children,
    parent,
    Ctor
) {
    const options = Ctor.options;
    this.data = data;
    this.props = props;
    this.children = children;
    this.parent = parent;
    this.listeners = data.on || emptyObject;
    this.injections = resolveInject(options.inject, parent);
    this.slots = () =
>
    resolveSlots(children, parent);

    // ensure the createElement function in functional components
    // gets a unique context - this is necessary for correct named slot check
    const contextVm = Object.create(parent);
    const isCompiled = isTrue(options._compiled);
    const needNormalization = !isCompiled;

    // support for compiled functional template
    if (isCompiled) {
        // exposing $options for renderStatic()
        this.$options = options;
        // pre-resolve slots for renderSlot()
        this.$slots = this.slots();
        this.$scopedSlots = data.scopedSlots || emptyObject;
    }

    if (options._scopeId) {
        this._c = (a, b, c, d) =
    >
        {
            const vnode = createElement(contextVm, a, b, c, d, needNormalization);
            if (vnode) {
                vnode.functionalScopeId = options._scopeId;
                vnode.functionalContext = parent;
            }
            return vnode
        }
        ;
    } else {
        this._c = (a, b, c, d) =
    >
        createElement(contextVm, a, b, c, d, needNormalization);
    }
}

installRenderHelpers(FunctionalRenderContext.prototype);

function createFunctionalComponent(
    Ctor,
    propsData,
    data,
    contextVm,
    children
) {
    const options = Ctor.options;
    const props = {};
    const propOptions = options.props;
    if (isDef(propOptions)) {
        for (const key in propOptions) {
            props[key] = validateProp(key, propOptions, propsData || emptyObject);
        }
    } else {
        if (isDef(data.attrs)) mergeProps(props, data.attrs);
        if (isDef(data.props)) mergeProps(props, data.props);
    }

    const renderContext = new FunctionalRenderContext(
        data,
        props,
        children,
        contextVm,
        Ctor
    );

    const vnode = options.render.call(null, renderContext._c, renderContext);

    if (vnode instanceof VNode) {
        vnode.functionalContext = contextVm;
        vnode.functionalOptions = options;
        if (data.slot) {
            (vnode.data || (vnode.data = {})).slot = data.slot;
        }
    }

    return vnode
}

function mergeProps(to, from) {
    for (const key in from) {
        to[camelize(key)] = from[key];
    }
}

/*  */

// hooks to be invoked on component VNodes during patch
const componentVNodeHooks = {
    init(
        vnode,
        hydrating,
        parentElm,
        refElm
    ) {
        if (!vnode.componentInstance || vnode.componentInstance._isDestroyed) {
            const child = vnode.componentInstance = createComponentInstanceForVnode(
                vnode,
                activeInstance,
                parentElm,
                refElm
            );
            child.$mount(hydrating ? vnode.elm : undefined, hydrating);
        } else if (vnode.data.keepAlive) {
            // kept-alive components, treat as a patch
            const mountedNode = vnode; // work around flow
            componentVNodeHooks.prepatch(mountedNode, mountedNode);
        }
    },

    prepatch(oldVnode, vnode) {
        const options = vnode.componentOptions;
        const child = vnode.componentInstance = oldVnode.componentInstance;
        updateChildComponent(
            child,
            options.propsData, // updated props
            options.listeners, // updated listeners
            vnode, // new parent vnode
            options.children // new children
        );
    },

    insert(vnode) {
        const {context, componentInstance} = vnode;
        if (!componentInstance._isMounted) {
            componentInstance._isMounted = true;
            callHook(componentInstance, 'mounted');
        }
        if (vnode.data.keepAlive) {
            if (context._isMounted) {
                // vue-router#1212
                // During updates, a kept-alive component's child components may
                // change, so directly walking the tree here may call activated hooks
                // on incorrect children. Instead we push them into a queue which will
                // be processed after the whole patch process ended.
                queueActivatedComponent(componentInstance);
            } else {
                activateChildComponent(componentInstance, true /* direct */);
            }
        }
    },

    destroy(vnode) {
        const {componentInstance} = vnode;
        if (!componentInstance._isDestroyed) {
            if (!vnode.data.keepAlive) {
                componentInstance.$destroy();
            } else {
                deactivateChildComponent(componentInstance, true /* direct */);
            }
        }
    }
};

const hooksToMerge = Object.keys(componentVNodeHooks);

function createComponent(
    Ctor,
    data,
    context,
    children,
    tag
) {
    if (isUndef(Ctor)) {
        return
    }

    const baseCtor = context.$options._base;

    // plain options object: turn it into a constructor
    if (isObject(Ctor)) {
        Ctor = baseCtor.extend(Ctor);
    }

    // if at this stage it's not a constructor or an async component factory,
    // reject.
    if (typeof Ctor !== 'function') {
        {
            warn(`Invalid Component definition: ${String(Ctor)}`, context);
        }
        return
    }

    // async component
    let asyncFactory;
    if (isUndef(Ctor.cid)) {
        asyncFactory = Ctor;
        Ctor = resolveAsyncComponent(asyncFactory, baseCtor, context);
        if (Ctor === undefined) {
            // return a placeholder node for async component, which is rendered
            // as a comment node but preserves all the raw information for the node.
            // the information will be used for async server-rendering and hydration.
            return createAsyncPlaceholder(
                asyncFactory,
                data,
                context,
                children,
                tag
            )
        }
    }

    data = data || {};

    // resolve constructor options in case global mixins are applied after
    // component constructor creation
    resolveConstructorOptions(Ctor);

    // transform component v-model data into props & events
    if (isDef(data.model)) {
        transformModel(Ctor.options, data);
    }

    // extract props
    const propsData = extractPropsFromVNodeData(data, Ctor, tag);

    // functional component
    if (isTrue(Ctor.options.functional)) {
        return createFunctionalComponent(Ctor, propsData, data, context, children)
    }

    // extract listeners, since these needs to be treated as
    // child component listeners instead of DOM listeners
    const listeners = data.on;
    // replace with listeners with .native modifier
    // so it gets processed during parent component patch.
    data.on = data.nativeOn;

    if (isTrue(Ctor.options.abstract)) {
        // abstract components do not keep anything
        // other than props & listeners & slot

        // work around flow
        const slot = data.slot;
        data = {};
        if (slot) {
            data.slot = slot;
        }
    }

    // merge component management hooks onto the placeholder node
    mergeHooks(data);

    // return a placeholder vnode
    const name = Ctor.options.name || tag;
    const vnode = new VNode(
        `vue-component-${Ctor.cid}${name ? `-${name}` : ''}`,
        data, undefined, undefined, undefined, context,
        {Ctor, propsData, listeners, tag, children},
        asyncFactory
    );
    return vnode
}

function createComponentInstanceForVnode(
    vnode, // we know it's MountedComponentVNode but flow doesn't
    parent, // activeInstance in lifecycle state
    parentElm,
    refElm
) {
    const vnodeComponentOptions = vnode.componentOptions;
    const options = {
        _isComponent: true,
        parent,
        propsData: vnodeComponentOptions.propsData,
        _componentTag: vnodeComponentOptions.tag,
        _parentVnode: vnode,
        _parentListeners: vnodeComponentOptions.listeners,
        _renderChildren: vnodeComponentOptions.children,
        _parentElm: parentElm || null,
        _refElm: refElm || null
    };
    // check inline-template render functions
    const inlineTemplate = vnode.data.inlineTemplate;
    if (isDef(inlineTemplate)) {
        options.render = inlineTemplate.render;
        options.staticRenderFns = inlineTemplate.staticRenderFns;
    }
    return new vnodeComponentOptions.Ctor(options)
}

function mergeHooks(data) {
    if (!data.hook) {
        data.hook = {};
    }
    for (let i = 0; i < hooksToMerge.length; i++) {
        const key = hooksToMerge[i];
        const fromParent = data.hook[key];
        const ours = componentVNodeHooks[key];
        data.hook[key] = fromParent ? mergeHook$1(ours, fromParent) : ours;
    }
}

function mergeHook$1(one, two) {
    return function (a, b, c, d) {
        one(a, b, c, d);
        two(a, b, c, d);
    }
}

// transform component v-model info (value and callback) into
// prop and event handler respectively.
function transformModel(options, data) {
    const prop = (options.model && options.model.prop) || 'value';
    const event = (options.model && options.model.event) || 'input';
    (data.props || (data.props = {}))[prop] = data.model.value;
    const on = data.on || (data.on = {});
    if (isDef(on[event])) {
        on[event] = [data.model.callback].concat(on[event]);
    } else {
        on[event] = data.model.callback;
    }
}

/*  */

const SIMPLE_NORMALIZE = 1;
const ALWAYS_NORMALIZE = 2;

// wrapper function for providing a more flexible interface
// without getting yelled at by flow
function createElement(
    context,
    tag,
    data,
    children,
    normalizationType,
    alwaysNormalize
) {
    if (Array.isArray(data) || isPrimitive(data)) {
        normalizationType = children;
        children = data;
        data = undefined;
    }
    if (isTrue(alwaysNormalize)) {
        normalizationType = ALWAYS_NORMALIZE;
    }
    return _createElement(context, tag, data, children, normalizationType)
}

function _createElement(
    context,
    tag,
    data,
    children,
    normalizationType
) {
    if (isDef(data) && isDef((data).__ob__)) {
        "development" !== 'production' && warn(
            `Avoid using observed data object as vnode data: ${JSON.stringify(data)}\n` +
            'Always create fresh vnode data objects in each render!',
            context
        );
        return createEmptyVNode()
    }
    // object syntax in v-bind
    if (isDef(data) && isDef(data.is)) {
        tag = data.is;
    }
    if (!tag) {
        // in case of component :is set to falsy value
        return createEmptyVNode()
    }
    // warn against non-primitive key
    if ("development" !== 'production' &&
        isDef(data) && isDef(data.key) && !isPrimitive(data.key)
    ) {
        warn(
            'Avoid using non-primitive value as key, ' +
            'use string/number value instead.',
            context
        );
    }
    // support single function children as default scoped slot
    if (Array.isArray(children) &&
        typeof children[0] === 'function'
    ) {
        data = data || {};
        data.scopedSlots = {default: children[0]};
        children.length = 0;
    }
    if (normalizationType === ALWAYS_NORMALIZE) {
        children = normalizeChildren(children);
    } else if (normalizationType === SIMPLE_NORMALIZE) {
        children = simpleNormalizeChildren(children);
    }
    let vnode, ns;
    if (typeof tag === 'string') {
        let Ctor;
        ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag);
        if (config.isReservedTag(tag)) {
            // platform built-in elements
            vnode = new VNode(
                config.parsePlatformTagName(tag), data, children,
                undefined, undefined, context
            );
        } else if (isDef(Ctor = resolveAsset(context.$options, 'components', tag))) {
            // component
            vnode = createComponent(Ctor, data, context, children, tag);
        } else {
            // unknown or unlisted namespaced elements
            // check at runtime because it may get assigned a namespace when its
            // parent normalizes children
            vnode = new VNode(
                tag, data, children,
                undefined, undefined, context
            );
        }
    } else {
        // direct component options / constructor
        vnode = createComponent(tag, data, context, children);
    }
    if (isDef(vnode)) {
        if (ns) applyNS(vnode, ns);
        return vnode
    } else {
        return createEmptyVNode()
    }
}

function applyNS(vnode, ns, force) {
    vnode.ns = ns;
    if (vnode.tag === 'foreignObject') {
        // use default namespace inside foreignObject
        ns = undefined;
        force = true;
    }
    if (isDef(vnode.children)) {
        for (let i = 0, l = vnode.children.length; i < l; i++) {
            const child = vnode.children[i];
            if (isDef(child.tag) && (isUndef(child.ns) || isTrue(force))) {
                applyNS(child, ns, force);
            }
        }
    }
}

/*  */

function initRender(vm) {
    vm._vnode = null; // the root of the child tree
    vm._staticTrees = null; // v-once cached trees
    const options = vm.$options;
    const parentVnode = vm.$vnode = options._parentVnode; // the placeholder node in parent tree
    const renderContext = parentVnode && parentVnode.context;
    vm.$slots = resolveSlots(options._renderChildren, renderContext);
    vm.$scopedSlots = emptyObject;
    // bind the createElement fn to this instance
    // so that we get proper render context inside it.
    // args order: tag, data, children, normalizationType, alwaysNormalize
    // internal version is used by render functions compiled from templates
    vm._c = (a, b, c, d) =
>
    createElement(vm, a, b, c, d, false);
    // normalization is always applied for the public version, used in
    // user-written render functions.
    vm.$createElement = (a, b, c, d) =
>
    createElement(vm, a, b, c, d, true);

    // $attrs & $listeners are exposed for easier HOC creation.
    // they need to be reactive so that HOCs using them are always updated
    const parentData = parentVnode && parentVnode.data;

    /* istanbul ignore else */
    {
        defineReactive(vm, '$attrs', parentData && parentData.attrs || emptyObject, () = > {
        !isUpdatingChildComponent && warn(`$attrs is readonly.`, vm);
    },
        true
    )
        ;
        defineReactive(vm, '$listeners', options._parentListeners || emptyObject, () = > {
        !isUpdatingChildComponent && warn(`$listeners is readonly.`, vm);
    },
        true
    )
        ;
    }
}

function renderMixin(Vue) {
    // install runtime convenience helpers
    installRenderHelpers(Vue.prototype);

    Vue.prototype.$nextTick = function (fn) {
        return nextTick(fn, this)
    };

    Vue.prototype._render = function () {
        const vm = this;
        const {render, _parentVnode} = vm.$options;

        if (vm._isMounted) {
            // if the parent didn't update, the slot nodes will be the ones from
            // last render. They need to be cloned to ensure "freshness" for this render.
            for (const key in vm.$slots) {
                const slot = vm.$slots[key];
                // _rendered is a flag added by renderSlot, but may not be present
                // if the slot is passed from manually written render functions
                if (slot._rendered || (slot[0] && slot[0].elm)) {
                    vm.$slots[key] = cloneVNodes(slot, true /* deep */);
                }
            }
        }

        vm.$scopedSlots = (_parentVnode && _parentVnode.data.scopedSlots) || emptyObject;

        // set parent vnode. this allows render functions to have access
        // to the data on the placeholder node.
        vm.$vnode = _parentVnode;
        // render self
        let vnode;
        try {
            vnode = render.call(vm._renderProxy, vm.$createElement);
        } catch (e) {
            handleError(e, vm, `render`);
            // return error render result,
            // or previous vnode to prevent render error causing blank component
            /* istanbul ignore else */
            {
                if (vm.$options.renderError) {
                    try {
                        vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e);
                    } catch (e) {
                        handleError(e, vm, `renderError`);
                        vnode = vm._vnode;
                    }
                } else {
                    vnode = vm._vnode;
                }
            }
        }
        // return empty vnode in case the render function errored out
        if (!(vnode instanceof VNode)) {
            if ("development" !== 'production' && Array.isArray(vnode)) {
                warn(
                    'Multiple root nodes returned from render function. Render function ' +
                    'should return a single root node.',
                    vm
                );
            }
            vnode = createEmptyVNode();
        }
        // set parent
        vnode.parent = _parentVnode;
        return vnode
    };
}

/*  */

let uid$1 = 0;

function initMixin(Vue) {
    Vue.prototype._init = function (options) {
        const vm = this;
        // a uid
        vm._uid = uid$1++;

        let startTag, endTag;
        /* istanbul ignore if */
        if ("development" !== 'production' && config.performance && mark) {
            startTag = `vue-perf-start:${vm._uid}`;
            endTag = `vue-perf-end:${vm._uid}`;
            mark(startTag);
        }

        // a flag to avoid this being observed
        vm._isVue = true;
        // merge options
        if (options && options._isComponent) {
            // optimize internal component instantiation
            // since dynamic options merging is pretty slow, and none of the
            // internal component options needs special treatment.
            initInternalComponent(vm, options);
        } else {
            vm.$options = mergeOptions(
                resolveConstructorOptions(vm.constructor),
                options || {},
                vm
            );
        }
        /* istanbul ignore else */
        {
            initProxy(vm);
        }
        // expose real self
        vm._self = vm;
        initLifecycle(vm);
        initEvents(vm);
        initRender(vm);
        callHook(vm, 'beforeCreate');
        initInjections(vm); // resolve injections before data/props
        initState(vm);
        initProvide(vm); // resolve provide after data/props
        callHook(vm, 'created');

        /* istanbul ignore if */
        if ("development" !== 'production' && config.performance && mark) {
            vm._name = formatComponentName(vm, false);
            mark(endTag);
            measure(`vue ${vm._name} init`, startTag, endTag);
        }

        if (vm.$options.el) {
            vm.$mount(vm.$options.el);
        }
    };
}

function initInternalComponent(vm, options) {
    const opts = vm.$options = Object.create(vm.constructor.options);
    // doing this because it's faster than dynamic enumeration.
    opts.parent = options.parent;
    opts.propsData = options.propsData;
    opts._parentVnode = options._parentVnode;
    opts._parentListeners = options._parentListeners;
    opts._renderChildren = options._renderChildren;
    opts._componentTag = options._componentTag;
    opts._parentElm = options._parentElm;
    opts._refElm = options._refElm;
    if (options.render) {
        opts.render = options.render;
        opts.staticRenderFns = options.staticRenderFns;
    }
}

function resolveConstructorOptions(Ctor) {
    let options = Ctor.options;
    if (Ctor.super) {
        const superOptions = resolveConstructorOptions(Ctor.super);
        const cachedSuperOptions = Ctor.superOptions;
        if (superOptions !== cachedSuperOptions) {
            // super option changed,
            // need to resolve new options.
            Ctor.superOptions = superOptions;
            // check if there are any late-modified/attached options (#4976)
            const modifiedOptions = resolveModifiedOptions(Ctor);
            // update base extend options
            if (modifiedOptions) {
                extend(Ctor.extendOptions, modifiedOptions);
            }
            options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions);
            if (options.name) {
                options.components[options.name] = Ctor;
            }
        }
    }
    return options
}

function resolveModifiedOptions(Ctor) {
    let modified;
    const latest = Ctor.options;
    const extended = Ctor.extendOptions;
    const sealed = Ctor.sealedOptions;
    for (const key in latest) {
        if (latest[key] !== sealed[key]) {
            if (!modified) modified = {};
            modified[key] = dedupe(latest[key], extended[key], sealed[key]);
        }
    }
    return modified
}

function dedupe(latest, extended, sealed) {
    // compare latest and sealed to ensure lifecycle hooks won't be duplicated
    // between merges
    if (Array.isArray(latest)) {
        const res = [];
        sealed = Array.isArray(sealed) ? sealed : [sealed];
        extended = Array.isArray(extended) ? extended : [extended];
        for (let i = 0; i < latest.length; i++) {
            // push original options and not sealed options to exclude duplicated options
            if (extended.indexOf(latest[i]) >= 0 || sealed.indexOf(latest[i]) < 0) {
                res.push(latest[i]);
            }
        }
        return res
    } else {
        return latest
    }
}

function Vue$3(options) {
    if ("development" !== 'production' &&
        !(this instanceof Vue$3)
    ) {
        warn('Vue is a constructor and should be called with the `new` keyword');
    }
    this._init(options);
}

initMixin(Vue$3);
stateMixin(Vue$3);
eventsMixin(Vue$3);
lifecycleMixin(Vue$3);
renderMixin(Vue$3);

/*  */

function initUse(Vue) {
    Vue.use = function (plugin) {
        const installedPlugins = (this._installedPlugins || (this._installedPlugins = []));
        if (installedPlugins.indexOf(plugin) > -1) {
            return this
        }

        // additional parameters
        const args = toArray(arguments, 1);
        args.unshift(this);
        if (typeof plugin.install === 'function') {
            plugin.install.apply(plugin, args);
        } else if (typeof plugin === 'function') {
            plugin.apply(null, args);
        }
        installedPlugins.push(plugin);
        return this
    };
}

/*  */

function initMixin$1(Vue) {
    Vue.mixin = function (mixin) {
        this.options = mergeOptions(this.options, mixin);
        return this
    };
}

/*  */

function initExtend(Vue) {
    /**
     * Each instance constructor, including Vue, has a unique
     * cid. This enables us to create wrapped "child
     * constructors" for prototypal inheritance and cache them.
     */
    Vue.cid = 0;
    let cid = 1;

    /**
     * Class inheritance
     */
    Vue.extend = function (extendOptions) {
        extendOptions = extendOptions || {};
        const Super = this;
        const SuperId = Super.cid;
        const cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {});
        if (cachedCtors[SuperId]) {
            return cachedCtors[SuperId]
        }

        const name = extendOptions.name || Super.options.name;
        {
            if (!/^[a-zA-Z][\w-]*$/.test(name)) {
                warn(
                    'Invalid component name: "' + name + '". Component names ' +
                    'can only contain alphanumeric characters and the hyphen, ' +
                    'and must start with a letter.'
                );
            }
        }

        const Sub = function VueComponent(options) {
            this._init(options);
        };
        Sub.prototype = Object.create(Super.prototype);
        Sub.prototype.constructor = Sub;
        Sub.cid = cid++;
        Sub.options = mergeOptions(
            Super.options,
            extendOptions
        );
        Sub['super'] = Super;

        // For props and computed properties, we define the proxy getters on
        // the Vue instances at extension time, on the extended prototype. This
        // avoids Object.defineProperty calls for each instance created.
        if (Sub.options.props) {
            initProps$1(Sub);
        }
        if (Sub.options.computed) {
            initComputed$1(Sub);
        }

        // allow further extension/mixin/plugin usage
        Sub.extend = Super.extend;
        Sub.mixin = Super.mixin;
        Sub.use = Super.use;

        // create asset registers, so extended classes
        // can have their private assets too.
        ASSET_TYPES.forEach(function (type) {
            Sub[type] = Super[type];
        });
        // enable recursive self-lookup
        if (name) {
            Sub.options.components[name] = Sub;
        }

        // keep a reference to the super options at extension time.
        // later at instantiation we can check if Super's options have
        // been updated.
        Sub.superOptions = Super.options;
        Sub.extendOptions = extendOptions;
        Sub.sealedOptions = extend({}, Sub.options);

        // cache constructor
        cachedCtors[SuperId] = Sub;
        return Sub
    };
}

function initProps$1(Comp) {
    const props = Comp.options.props;
    for (const key in props) {
        proxy(Comp.prototype, `_props`, key);
    }
}

function initComputed$1(Comp) {
    const computed = Comp.options.computed;
    for (const key in computed) {
        defineComputed(Comp.prototype, key, computed[key]);
    }
}

/*  */

function initAssetRegisters(Vue) {
    /**
     * Create asset registration methods.
     */
    ASSET_TYPES.forEach(type = > {
        Vue[type] = function (
            id,
            definition
        ) {
            if (!definition) {
                return this.options[type + 's'][id]
            } else {
                /* istanbul ignore if */
                {
                    if (type === 'component' && config.isReservedTag(id)) {
                        warn(
                            'Do not use built-in or reserved HTML elements as component ' +
                            'id: ' + id
                        );
                    }
                }
                if (type === 'component' && isPlainObject(definition)) {
                    definition.name = definition.name || id;
                    definition = this.options._base.extend(definition);
                }
                if (type === 'directive' && typeof definition === 'function') {
                    definition = {bind: definition, update: definition};
                }
                this.options[type + 's'][id] = definition;
                return definition
            }
        };
})
    ;
}

/*  */

function getComponentName(opts) {
    return opts && (opts.Ctor.options.name || opts.tag)
}

function matches(pattern, name) {
    if (Array.isArray(pattern)) {
        return pattern.indexOf(name) > -1
    } else if (typeof pattern === 'string') {
        return pattern.split(',').indexOf(name) > -1
    } else if (isRegExp(pattern)) {
        return pattern.test(name)
    }
    /* istanbul ignore next */
    return false
}

function pruneCache(keepAliveInstance, filter) {
    const {cache, keys, _vnode} = keepAliveInstance;
    for (const key in cache) {
        const cachedNode = cache[key];
        if (cachedNode) {
            const name = getComponentName(cachedNode.componentOptions);
            if (name && !filter(name)) {
                pruneCacheEntry(cache, key, keys, _vnode);
            }
        }
    }
}

function pruneCacheEntry(
    cache,
    key,
    keys,
    current
) {
    const cached$$1 = cache[key];
    if (cached$$1 && cached$$1 !== current) {
        cached$$1.componentInstance.$destroy();
    }
    cache[key] = null;
    remove(keys, key);
}

const patternTypes = [String, RegExp, Array];

var KeepAlive = {
    name: 'keep-alive',
    abstract: true,

    props: {
        include: patternTypes,
        exclude: patternTypes,
        max: [String, Number]
    },

    created() {
        this.cache = Object.create(null);
        this.keys = [];
    },

    destroyed() {
        for (const key in this.cache) {
            pruneCacheEntry(this.cache, key, this.keys);
        }
    },

    watch: {
        include(val) {
            pruneCache(this, name = > matches(val, name)
        )
            ;
        },
        exclude(val) {
            pruneCache(this, name = > !matches(val, name)
        )
            ;
        }
    },

    render() {
        const slot = this.$slots.default;
        const vnode = getFirstComponentChild(slot);
        const componentOptions = vnode && vnode.componentOptions;
        if (componentOptions) {
            // check pattern
            const name = getComponentName(componentOptions);
            const {include, exclude} = this;
            if (
                // not included
                (include && (!name || !matches(include, name))) ||
                // excluded
                (exclude && name && matches(exclude, name))
            ) {
                return vnode
            }

            const {cache, keys} = this;
            const key = vnode.key == null
                // same constructor may get registered as different local components
                // so cid alone is not enough (#3269)
                ? componentOptions.Ctor.cid + (componentOptions.tag ? `::${componentOptions.tag}` : '')
                : vnode.key;
            if (cache[key]) {
                vnode.componentInstance = cache[key].componentInstance;
                // make current key freshest
                remove(keys, key);
                keys.push(key);
            } else {
                cache[key] = vnode;
                keys.push(key);
                // prune oldest entry
                if (this.max && keys.length > parseInt(this.max)) {
                    pruneCacheEntry(cache, keys[0], keys, this._vnode);
                }
            }

            vnode.data.keepAlive = true;
        }
        return vnode || (slot && slot[0])
    }
};

var builtInComponents = {
    KeepAlive
};

/*  */

function initGlobalAPI(Vue) {
    // config
    const configDef = {};
    configDef.get = () =
>
    config;
    {
        configDef.set = () =
    >
        {
            warn(
                'Do not replace the Vue.config object, set individual fields instead.'
            );
        }
        ;
    }
    Object.defineProperty(Vue, 'config', configDef);

    // exposed util methods.
    // NOTE: these are not considered part of the public API - avoid relying on
    // them unless you are aware of the risk.
    Vue.util = {
        warn,
        extend,
        mergeOptions,
        defineReactive
    };

    Vue.set = set;
    Vue.delete = del;
    Vue.nextTick = nextTick;

    Vue.options = Object.create(null);
    ASSET_TYPES.forEach(type = > {
        Vue.options[type + 's'] = Object.create(null);
})
    ;

    // this is used to identify the "base" constructor to extend all plain-object
    // components with in Weex's multi-instance scenarios.
    Vue.options._base = Vue;

    extend(Vue.options.components, builtInComponents);

    initUse(Vue);
    initMixin$1(Vue);
    initExtend(Vue);
    initAssetRegisters(Vue);
}

initGlobalAPI(Vue$3);

Object.defineProperty(Vue$3.prototype, '$isServer', {
    get: isServerRendering
});

Object.defineProperty(Vue$3.prototype, '$ssrContext', {
    get() {
        /* istanbul ignore next */
        return this.$vnode && this.$vnode.ssrContext
    }
});

Vue$3.version = '2.5.8';

/*  */

// these are reserved for web because they are directly compiled away
// during template compilation
const isReservedAttr = makeMap('style,class');

// attributes that should be using props for binding
const acceptValue = makeMap('input,textarea,option,select,progress');
const mustUseProp = (tag, type, attr) =
>
{
    return (
        (attr === 'value' && acceptValue(tag)) && type !== 'button' ||
        (attr === 'selected' && tag === 'option') ||
        (attr === 'checked' && tag === 'input') ||
        (attr === 'muted' && tag === 'video')
    )
}
;

const isEnumeratedAttr = makeMap('contenteditable,draggable,spellcheck');

const isBooleanAttr = makeMap(
    'allowfullscreen,async,autofocus,autoplay,checked,compact,controls,declare,' +
    'default,defaultchecked,defaultmuted,defaultselected,defer,disabled,' +
    'enabled,formnovalidate,hidden,indeterminate,inert,ismap,itemscope,loop,multiple,' +
    'muted,nohref,noresize,noshade,novalidate,nowrap,open,pauseonexit,readonly,' +
    'required,reversed,scoped,seamless,selected,sortable,translate,' +
    'truespeed,typemustmatch,visible'
);

const xlinkNS = 'http://www.w3.org/1999/xlink';

const isXlink = (name) =
>
{
    return name.charAt(5) === ':' && name.slice(0, 5) === 'xlink'
}
;

const getXlinkProp = (name) =
>
{
    return isXlink(name) ? name.slice(6, name.length) : ''
}
;

const isFalsyAttrValue = (val) =
>
{
    return val == null || val === false
}
;

/*  */

function genClassForVnode(vnode) {
    let data = vnode.data;
    let parentNode = vnode;
    let childNode = vnode;
    while (isDef(childNode.componentInstance)) {
        childNode = childNode.componentInstance._vnode;
        if (childNode.data) {
            data = mergeClassData(childNode.data, data);
        }
    }
    while (isDef(parentNode = parentNode.parent)) {
        if (parentNode.data) {
            data = mergeClassData(data, parentNode.data);
        }
    }
    return renderClass(data.staticClass, data.class)
}

function mergeClassData(child, parent) {
    return {
        staticClass: concat(child.staticClass, parent.staticClass),
        class: isDef(child.class)
            ? [child.class, parent.class]
            : parent.class
    }
}

function renderClass(
    staticClass,
    dynamicClass
) {
    if (isDef(staticClass) || isDef(dynamicClass)) {
        return concat(staticClass, stringifyClass(dynamicClass))
    }
    /* istanbul ignore next */
    return ''
}

function concat(a, b) {
    return a ? b ? (a + ' ' + b) : a : (b || '')
}

function stringifyClass(value) {
    if (Array.isArray(value)) {
        return stringifyArray(value)
    }
    if (isObject(value)) {
        return stringifyObject(value)
    }
    if (typeof value === 'string') {
        return value
    }
    /* istanbul ignore next */
    return ''
}

function stringifyArray(value) {
    let res = '';
    let stringified;
    for (let i = 0, l = value.length; i < l; i++) {
        if (isDef(stringified = stringifyClass(value[i])) && stringified !== '') {
            if (res) res += ' ';
            res += stringified;
        }
    }
    return res
}

function stringifyObject(value) {
    let res = '';
    for (const key in value) {
        if (value[key]) {
            if (res) res += ' ';
            res += key;
        }
    }
    return res
}

/*  */

const namespaceMap = {
    svg: 'http://www.w3.org/2000/svg',
    math: 'http://www.w3.org/1998/Math/MathML'
};

const isHTMLTag = makeMap(
    'html,body,base,head,link,meta,style,title,' +
    'address,article,aside,footer,header,h1,h2,h3,h4,h5,h6,hgroup,nav,section,' +
    'div,dd,dl,dt,figcaption,figure,picture,hr,img,li,main,ol,p,pre,ul,' +
    'a,b,abbr,bdi,bdo,br,cite,code,data,dfn,em,i,kbd,mark,q,rp,rt,rtc,ruby,' +
    's,samp,small,span,strong,sub,sup,time,u,var,wbr,area,audio,map,track,video,' +
    'embed,object,param,source,canvas,script,noscript,del,ins,' +
    'caption,col,colgroup,table,thead,tbody,td,th,tr,' +
    'button,datalist,fieldset,form,input,label,legend,meter,optgroup,option,' +
    'output,progress,select,textarea,' +
    'details,dialog,menu,menuitem,summary,' +
    'content,element,shadow,template,blockquote,iframe,tfoot'
);

// this map is intentionally selective, only covering SVG elements that may
// contain child elements.
const isSVG = makeMap(
    'svg,animate,circle,clippath,cursor,defs,desc,ellipse,filter,font-face,' +
    'foreignObject,g,glyph,image,line,marker,mask,missing-glyph,path,pattern,' +
    'polygon,polyline,rect,switch,symbol,text,textpath,tspan,use,view',
    true
);

const isPreTag = (tag) =
>
tag === 'pre';

const isReservedTag = (tag) =
>
{
    return isHTMLTag(tag) || isSVG(tag)
}
;

function getTagNamespace(tag) {
    if (isSVG(tag)) {
        return 'svg'
    }
    // basic support for MathML
    // note it doesn't support other MathML elements being component roots
    if (tag === 'math') {
        return 'math'
    }
}

const unknownElementCache = Object.create(null);

function isUnknownElement(tag) {
    /* istanbul ignore if */
    if (!inBrowser) {
        return true
    }
    if (isReservedTag(tag)) {
        return false
    }
    tag = tag.toLowerCase();
    /* istanbul ignore if */
    if (unknownElementCache[tag] != null) {
        return unknownElementCache[tag]
    }
    const el = document.createElement(tag);
    if (tag.indexOf('-') > -1) {
        // http://stackoverflow.com/a/28210364/1070244
        return (unknownElementCache[tag] = (
            el.constructor === window.HTMLUnknownElement ||
            el.constructor === window.HTMLElement
        ))
    } else {
        return (unknownElementCache[tag] = /HTMLUnknownElement/.test(el.toString()))
    }
}

const isTextInputType = makeMap('text,number,password,search,email,tel,url');

/*  */

/**
 * Query an element selector if it's not an element already.
 */
function query(el) {
    if (typeof el === 'string') {
        const selected = document.querySelector(el);
        if (!selected) {
            "development" !== 'production' && warn(
                'Cannot find element: ' + el
            );
            return document.createElement('div')
        }
        return selected
    } else {
        return el
    }
}

/*  */

function createElement$1(tagName, vnode) {
    const elm = document.createElement(tagName);
    if (tagName !== 'select') {
        return elm
    }
    // false or null will remove the attribute but undefined will not
    if (vnode.data && vnode.data.attrs && vnode.data.attrs.multiple !== undefined) {
        elm.setAttribute('multiple', 'multiple');
    }
    return elm
}

function createElementNS(namespace, tagName) {
    return document.createElementNS(namespaceMap[namespace], tagName)
}

function createTextNode(text) {
    return document.createTextNode(text)
}

function createComment(text) {
    return document.createComment(text)
}

function insertBefore(parentNode, newNode, referenceNode) {
    parentNode.insertBefore(newNode, referenceNode);
}

function removeChild(node, child) {
    node.removeChild(child);
}

function appendChild(node, child) {
    node.appendChild(child);
}

function parentNode(node) {
    return node.parentNode
}

function nextSibling(node) {
    return node.nextSibling
}

function tagName(node) {
    return node.tagName
}

function setTextContent(node, text) {
    node.textContent = text;
}

function setAttribute(node, key, val) {
    node.setAttribute(key, val);
}


var nodeOps = Object.freeze({
    createElement: createElement$1,
    createElementNS: createElementNS,
    createTextNode: createTextNode,
    createComment: createComment,
    insertBefore: insertBefore,
    removeChild: removeChild,
    appendChild: appendChild,
    parentNode: parentNode,
    nextSibling: nextSibling,
    tagName: tagName,
    setTextContent: setTextContent,
    setAttribute: setAttribute
});

/*  */

var ref = {
    create(_, vnode) {
        registerRef(vnode);
    },
    update(oldVnode, vnode) {
        if (oldVnode.data.ref !== vnode.data.ref) {
            registerRef(oldVnode, true);
            registerRef(vnode);
        }
    },
    destroy(vnode) {
        registerRef(vnode, true);
    }
};

function registerRef(vnode, isRemoval) {
    const key = vnode.data.ref;
    if (!key) return

    const vm = vnode.context;
    const ref = vnode.componentInstance || vnode.elm;
    const refs = vm.$refs;
    if (isRemoval) {
        if (Array.isArray(refs[key])) {
            remove(refs[key], ref);
        } else if (refs[key] === ref) {
            refs[key] = undefined;
        }
    } else {
        if (vnode.data.refInFor) {
            if (!Array.isArray(refs[key])) {
                refs[key] = [ref];
            } else if (refs[key].indexOf(ref) < 0) {
                // $flow-disable-line
                refs[key].push(ref);
            }
        } else {
            refs[key] = ref;
        }
    }
}

/**
 * Virtual DOM patching algorithm based on Snabbdom by
 * Simon Friis Vindum (@paldepind)
 * Licensed under the MIT License
 * https://github.com/paldepind/snabbdom/blob/master/LICENSE
 *
 * modified by Evan You (@yyx990803)
 *
 * Not type-checking this because this file is perf-critical and the cost
 * of making flow understand it is not worth it.
 */

const emptyNode = new VNode('', {}, []);

const hooks = ['create', 'activate', 'update', 'remove', 'destroy'];

function sameVnode(a, b) {
    return (
        a.key === b.key && (
            (
                a.tag === b.tag &&
                a.isComment === b.isComment &&
                isDef(a.data) === isDef(b.data) &&
                sameInputType(a, b)
            ) || (
                isTrue(a.isAsyncPlaceholder) &&
                a.asyncFactory === b.asyncFactory &&
                isUndef(b.asyncFactory.error)
            )
        )
    )
}

function sameInputType(a, b) {
    if (a.tag !== 'input') return true
    let i;
    const typeA = isDef(i = a.data) && isDef(i = i.attrs) && i.type;
    const typeB = isDef(i = b.data) && isDef(i = i.attrs) && i.type;
    return typeA === typeB || isTextInputType(typeA) && isTextInputType(typeB)
}

function createKeyToOldIdx(children, beginIdx, endIdx) {
    let i, key;
    const map = {};
    for (i = beginIdx; i <= endIdx; ++i) {
        key = children[i].key;
        if (isDef(key)) map[key] = i;
    }
    return map
}

function createPatchFunction(backend) {
    let i, j;
    const cbs = {};

    const {modules, nodeOps} = backend;

    for (i = 0; i < hooks.length; ++i) {
        cbs[hooks[i]] = [];
        for (j = 0; j < modules.length; ++j) {
            if (isDef(modules[j][hooks[i]])) {
                cbs[hooks[i]].push(modules[j][hooks[i]]);
            }
        }
    }

    function emptyNodeAt(elm) {
        return new VNode(nodeOps.tagName(elm).toLowerCase(), {}, [], undefined, elm)
    }

    function createRmCb(childElm, listeners) {
        function remove() {
            if (--remove.listeners === 0) {
                removeNode(childElm);
            }
        }

        remove.listeners = listeners;
        return remove
    }

    function removeNode(el) {
        const parent = nodeOps.parentNode(el);
        // element may have already been removed due to v-html / v-text
        if (isDef(parent)) {
            nodeOps.removeChild(parent, el);
        }
    }

    function isUnknownElement$$1(vnode, inVPre) {
        return (
                !inVPre &&
                !vnode.ns &&
                !(
                    config.ignoredElements.length &&
                    config.ignoredElements.some(ignore = > {
                        return isRegExp(ignore)
                            ? ignore.test(vnode.tag)
                            : ignore === vnode.tag
                    })
            ) &&
            config.isUnknownElement(vnode.tag)
    )
    }

    let creatingElmInVPre = 0;

    function createElm(vnode, insertedVnodeQueue, parentElm, refElm, nested) {
        vnode.isRootInsert = !nested; // for transition enter check
        if (createComponent(vnode, insertedVnodeQueue, parentElm, refElm)) {
            return
        }

        const data = vnode.data;
        const children = vnode.children;
        const tag = vnode.tag;
        if (isDef(tag)) {
            {
                if (data && data.pre) {
                    creatingElmInVPre++;
                }
                if (isUnknownElement$$1(vnode, creatingElmInVPre)) {
                    warn(
                        'Unknown custom element: <' + tag + '> - did you ' +
                        'register the component correctly? For recursive components, ' +
                        'make sure to provide the "name" option.',
                        vnode.context
                    );
                }
            }
            vnode.elm = vnode.ns
                ? nodeOps.createElementNS(vnode.ns, tag)
                : nodeOps.createElement(tag, vnode);
            setScope(vnode);

            /* istanbul ignore if */
            {
                createChildren(vnode, children, insertedVnodeQueue);
                if (isDef(data)) {
                    invokeCreateHooks(vnode, insertedVnodeQueue);
                }
                insert(parentElm, vnode.elm, refElm);
            }

            if ("development" !== 'production' && data && data.pre) {
                creatingElmInVPre--;
            }
        } else if (isTrue(vnode.isComment)) {
            vnode.elm = nodeOps.createComment(vnode.text);
            insert(parentElm, vnode.elm, refElm);
        } else {
            vnode.elm = nodeOps.createTextNode(vnode.text);
            insert(parentElm, vnode.elm, refElm);
        }
    }

    function createComponent(vnode, insertedVnodeQueue, parentElm, refElm) {
        let i = vnode.data;
        if (isDef(i)) {
            const isReactivated = isDef(vnode.componentInstance) && i.keepAlive;
            if (isDef(i = i.hook) && isDef(i = i.init)) {
                i(vnode, false /* hydrating */, parentElm, refElm);
            }
            // after calling the init hook, if the vnode is a child component
            // it should've created a child instance and mounted it. the child
            // component also has set the placeholder vnode's elm.
            // in that case we can just return the element and be done.
            if (isDef(vnode.componentInstance)) {
                initComponent(vnode, insertedVnodeQueue);
                if (isTrue(isReactivated)) {
                    reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm);
                }
                return true
            }
        }
    }

    function initComponent(vnode, insertedVnodeQueue) {
        if (isDef(vnode.data.pendingInsert)) {
            insertedVnodeQueue.push.apply(insertedVnodeQueue, vnode.data.pendingInsert);
            vnode.data.pendingInsert = null;
        }
        vnode.elm = vnode.componentInstance.$el;
        if (isPatchable(vnode)) {
            invokeCreateHooks(vnode, insertedVnodeQueue);
            setScope(vnode);
        } else {
            // empty component root.
            // skip all element-related modules except for ref (#3455)
            registerRef(vnode);
            // make sure to invoke the insert hook
            insertedVnodeQueue.push(vnode);
        }
    }

    function reactivateComponent(vnode, insertedVnodeQueue, parentElm, refElm) {
        let i;
        // hack for #4339: a reactivated component with inner transition
        // does not trigger because the inner node's created hooks are not called
        // again. It's not ideal to involve module-specific logic in here but
        // there doesn't seem to be a better way to do it.
        let innerNode = vnode;
        while (innerNode.componentInstance) {
            innerNode = innerNode.componentInstance._vnode;
            if (isDef(i = innerNode.data) && isDef(i = i.transition)) {
                for (i = 0; i < cbs.activate.length; ++i) {
                    cbs.activate[i](emptyNode, innerNode);
                }
                insertedVnodeQueue.push(innerNode);
                break
            }
        }
        // unlike a newly created component,
        // a reactivated keep-alive component doesn't insert itself
        insert(parentElm, vnode.elm, refElm);
    }

    function insert(parent, elm, ref$$1) {
        if (isDef(parent)) {
            if (isDef(ref$$1)) {
                if (ref$$1.parentNode === parent) {
                    nodeOps.insertBefore(parent, elm, ref$$1);
                }
            } else {
                nodeOps.appendChild(parent, elm);
            }
        }
    }

    function createChildren(vnode, children, insertedVnodeQueue) {
        if (Array.isArray(children)) {
            for (let i = 0; i < children.length; ++i) {
                createElm(children[i], insertedVnodeQueue, vnode.elm, null, true);
            }
        } else if (isPrimitive(vnode.text)) {
            nodeOps.appendChild(vnode.elm, nodeOps.createTextNode(vnode.text));
        }
    }

    function isPatchable(vnode) {
        while (vnode.componentInstance) {
            vnode = vnode.componentInstance._vnode;
        }
        return isDef(vnode.tag)
    }

    function invokeCreateHooks(vnode, insertedVnodeQueue) {
        for (let i = 0; i < cbs.create.length; ++i) {
            cbs.create[i](emptyNode, vnode);
        }
        i = vnode.data.hook; // Reuse variable
        if (isDef(i)) {
            if (isDef(i.create)) i.create(emptyNode, vnode);
            if (isDef(i.insert)) insertedVnodeQueue.push(vnode);
        }
    }

    // set scope id attribute for scoped CSS.
    // this is implemented as a special case to avoid the overhead
    // of going through the normal attribute patching process.
    function setScope(vnode) {
        let i;
        if (isDef(i = vnode.functionalScopeId)) {
            nodeOps.setAttribute(vnode.elm, i, '');
        } else {
            let ancestor = vnode;
            while (ancestor) {
                if (isDef(i = ancestor.context) && isDef(i = i.$options._scopeId)) {
                    nodeOps.setAttribute(vnode.elm, i, '');
                }
                ancestor = ancestor.parent;
            }
        }
        // for slot content they should also get the scopeId from the host instance.
        if (isDef(i = activeInstance) &&
            i !== vnode.context &&
            i !== vnode.functionalContext &&
            isDef(i = i.$options._scopeId)
        ) {
            nodeOps.setAttribute(vnode.elm, i, '');
        }
    }

    function addVnodes(parentElm, refElm, vnodes, startIdx, endIdx, insertedVnodeQueue) {
        for (; startIdx <= endIdx; ++startIdx) {
            createElm(vnodes[startIdx], insertedVnodeQueue, parentElm, refElm);
        }
    }

    function invokeDestroyHook(vnode) {
        let i, j;
        const data = vnode.data;
        if (isDef(data)) {
            if (isDef(i = data.hook) && isDef(i = i.destroy)) i(vnode);
            for (i = 0; i < cbs.destroy.length; ++i) cbs.destroy[i](vnode);
        }
        if (isDef(i = vnode.children)) {
            for (j = 0; j < vnode.children.length; ++j) {
                invokeDestroyHook(vnode.children[j]);
            }
        }
    }

    function removeVnodes(parentElm, vnodes, startIdx, endIdx) {
        for (; startIdx <= endIdx; ++startIdx) {
            const ch = vnodes[startIdx];
            if (isDef(ch)) {
                if (isDef(ch.tag)) {
                    removeAndInvokeRemoveHook(ch);
                    invokeDestroyHook(ch);
                } else { // Text node
                    removeNode(ch.elm);
                }
            }
        }
    }

    function removeAndInvokeRemoveHook(vnode, rm) {
        if (isDef(rm) || isDef(vnode.data)) {
            let i;
            const listeners = cbs.remove.length + 1;
            if (isDef(rm)) {
                // we have a recursively passed down rm callback
                // increase the listeners count
                rm.listeners += listeners;
            } else {
                // directly removing
                rm = createRmCb(vnode.elm, listeners);
            }
            // recursively invoke hooks on child component root node
            if (isDef(i = vnode.componentInstance) && isDef(i = i._vnode) && isDef(i.data)) {
                removeAndInvokeRemoveHook(i, rm);
            }
            for (i = 0; i < cbs.remove.length; ++i) {
                cbs.remove[i](vnode, rm);
            }
            if (isDef(i = vnode.data.hook) && isDef(i = i.remove)) {
                i(vnode, rm);
            } else {
                rm();
            }
        } else {
            removeNode(vnode.elm);
        }
    }

    function updateChildren(parentElm, oldCh, newCh, insertedVnodeQueue, removeOnly) {
        let oldStartIdx = 0;
        let newStartIdx = 0;
        let oldEndIdx = oldCh.length - 1;
        let oldStartVnode = oldCh[0];
        let oldEndVnode = oldCh[oldEndIdx];
        let newEndIdx = newCh.length - 1;
        let newStartVnode = newCh[0];
        let newEndVnode = newCh[newEndIdx];
        let oldKeyToIdx, idxInOld, vnodeToMove, refElm;

        // removeOnly is a special flag used only by <transition-group>
        // to ensure removed elements stay in correct relative positions
        // during leaving transitions
        const canMove = !removeOnly;

        while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
            if (isUndef(oldStartVnode)) {
                oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left
            } else if (isUndef(oldEndVnode)) {
                oldEndVnode = oldCh[--oldEndIdx];
            } else if (sameVnode(oldStartVnode, newStartVnode)) {
                patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue);
                oldStartVnode = oldCh[++oldStartIdx];
                newStartVnode = newCh[++newStartIdx];
            } else if (sameVnode(oldEndVnode, newEndVnode)) {
                patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue);
                oldEndVnode = oldCh[--oldEndIdx];
                newEndVnode = newCh[--newEndIdx];
            } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
                patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue);
                canMove && nodeOps.insertBefore(parentElm, oldStartVnode.elm, nodeOps.nextSibling(oldEndVnode.elm));
                oldStartVnode = oldCh[++oldStartIdx];
                newEndVnode = newCh[--newEndIdx];
            } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
                patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue);
                canMove && nodeOps.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
                oldEndVnode = oldCh[--oldEndIdx];
                newStartVnode = newCh[++newStartIdx];
            } else {
                if (isUndef(oldKeyToIdx)) oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx);
                idxInOld = isDef(newStartVnode.key)
                    ? oldKeyToIdx[newStartVnode.key]
                    : findIdxInOld(newStartVnode, oldCh, oldStartIdx, oldEndIdx);
                if (isUndef(idxInOld)) { // New element
                    createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm);
                } else {
                    vnodeToMove = oldCh[idxInOld];
                    /* istanbul ignore if */
                    if ("development" !== 'production' && !vnodeToMove) {
                        warn(
                            'It seems there are duplicate keys that is causing an update error. ' +
                            'Make sure each v-for item has a unique key.'
                        );
                    }
                    if (sameVnode(vnodeToMove, newStartVnode)) {
                        patchVnode(vnodeToMove, newStartVnode, insertedVnodeQueue);
                        oldCh[idxInOld] = undefined;
                        canMove && nodeOps.insertBefore(parentElm, vnodeToMove.elm, oldStartVnode.elm);
                    } else {
                        // same key but different element. treat as new element
                        createElm(newStartVnode, insertedVnodeQueue, parentElm, oldStartVnode.elm);
                    }
                }
                newStartVnode = newCh[++newStartIdx];
            }
        }
        if (oldStartIdx > oldEndIdx) {
            refElm = isUndef(newCh[newEndIdx + 1]) ? null : newCh[newEndIdx + 1].elm;
            addVnodes(parentElm, refElm, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
        } else if (newStartIdx > newEndIdx) {
            removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx);
        }
    }

    function findIdxInOld(node, oldCh, start, end) {
        for (let i = start; i < end; i++) {
            const c = oldCh[i];
            if (isDef(c) && sameVnode(node, c)) return i
        }
    }

    function patchVnode(oldVnode, vnode, insertedVnodeQueue, removeOnly) {
        if (oldVnode === vnode) {
            return
        }

        const elm = vnode.elm = oldVnode.elm;

        if (isTrue(oldVnode.isAsyncPlaceholder)) {
            if (isDef(vnode.asyncFactory.resolved)) {
                hydrate(oldVnode.elm, vnode, insertedVnodeQueue);
            } else {
                vnode.isAsyncPlaceholder = true;
            }
            return
        }

        // reuse element for static trees.
        // note we only do this if the vnode is cloned -
        // if the new node is not cloned it means the render functions have been
        // reset by the hot-reload-api and we need to do a proper re-render.
        if (isTrue(vnode.isStatic) &&
            isTrue(oldVnode.isStatic) &&
            vnode.key === oldVnode.key &&
            (isTrue(vnode.isCloned) || isTrue(vnode.isOnce))
        ) {
            vnode.componentInstance = oldVnode.componentInstance;
            return
        }

        let i;
        const data = vnode.data;
        if (isDef(data) && isDef(i = data.hook) && isDef(i = i.prepatch)) {
            i(oldVnode, vnode);
        }

        const oldCh = oldVnode.children;
        const ch = vnode.children;
        if (isDef(data) && isPatchable(vnode)) {
            for (i = 0; i < cbs.update.length; ++i) cbs.update[i](oldVnode, vnode);
            if (isDef(i = data.hook) && isDef(i = i.update)) i(oldVnode, vnode);
        }
        if (isUndef(vnode.text)) {
            if (isDef(oldCh) && isDef(ch)) {
                if (oldCh !== ch) updateChildren(elm, oldCh, ch, insertedVnodeQueue, removeOnly);
            } else if (isDef(ch)) {
                if (isDef(oldVnode.text)) nodeOps.setTextContent(elm, '');
                addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
            } else if (isDef(oldCh)) {
                removeVnodes(elm, oldCh, 0, oldCh.length - 1);
            } else if (isDef(oldVnode.text)) {
                nodeOps.setTextContent(elm, '');
            }
        } else if (oldVnode.text !== vnode.text) {
            nodeOps.setTextContent(elm, vnode.text);
        }
        if (isDef(data)) {
            if (isDef(i = data.hook) && isDef(i = i.postpatch)) i(oldVnode, vnode);
        }
    }

    function invokeInsertHook(vnode, queue, initial) {
        // delay insert hooks for component root nodes, invoke them after the
        // element is really inserted
        if (isTrue(initial) && isDef(vnode.parent)) {
            vnode.parent.data.pendingInsert = queue;
        } else {
            for (let i = 0; i < queue.length; ++i) {
                queue[i].data.hook.insert(queue[i]);
            }
        }
    }

    let hydrationBailed = false;
    // list of modules that can skip create hook during hydration because they
    // are already rendered on the client or has no need for initialization
    // Note: style is excluded because it relies on initial clone for future
    // deep updates (#7063).
    const isRenderedModule = makeMap('attrs,class,staticClass,staticStyle,key');

    // Note: this is a browser-only function so we can assume elms are DOM nodes.
    function hydrate(elm, vnode, insertedVnodeQueue, inVPre) {
        let i;
        const {tag, data, children} = vnode;
        inVPre = inVPre || (data && data.pre);
        vnode.elm = elm;

        if (isTrue(vnode.isComment) && isDef(vnode.asyncFactory)) {
            vnode.isAsyncPlaceholder = true;
            return true
        }
        // assert node match
        {
            if (!assertNodeMatch(elm, vnode, inVPre)) {
                return false
            }
        }
        if (isDef(data)) {
            if (isDef(i = data.hook) && isDef(i = i.init)) i(vnode, true /* hydrating */);
            if (isDef(i = vnode.componentInstance)) {
                // child component. it should have hydrated its own tree.
                initComponent(vnode, insertedVnodeQueue);
                return true
            }
        }
        if (isDef(tag)) {
            if (isDef(children)) {
                // empty element, allow client to pick up and populate children
                if (!elm.hasChildNodes()) {
                    createChildren(vnode, children, insertedVnodeQueue);
                } else {
                    // v-html and domProps: innerHTML
                    if (isDef(i = data) && isDef(i = i.domProps) && isDef(i = i.innerHTML)) {
                        if (i !== elm.innerHTML) {
                            /* istanbul ignore if */
                            if ("development" !== 'production' &&
                                typeof console !== 'undefined' &&
                                !hydrationBailed
                            ) {
                                hydrationBailed = true;
                                console.warn('Parent: ', elm);
                                console.warn('server innerHTML: ', i);
                                console.warn('client innerHTML: ', elm.innerHTML);
                            }
                            return false
                        }
                    } else {
                        // iterate and compare children lists
                        let childrenMatch = true;
                        let childNode = elm.firstChild;
                        for (let i = 0; i < children.length; i++) {
                            if (!childNode || !hydrate(childNode, children[i], insertedVnodeQueue, inVPre)) {
                                childrenMatch = false;
                                break
                            }
                            childNode = childNode.nextSibling;
                        }
                        // if childNode is not null, it means the actual childNodes list is
                        // longer than the virtual children list.
                        if (!childrenMatch || childNode) {
                            /* istanbul ignore if */
                            if ("development" !== 'production' &&
                                typeof console !== 'undefined' &&
                                !hydrationBailed
                            ) {
                                hydrationBailed = true;
                                console.warn('Parent: ', elm);
                                console.warn('Mismatching childNodes vs. VNodes: ', elm.childNodes, children);
                            }
                            return false
                        }
                    }
                }
            }
            if (isDef(data)) {
                let fullInvoke = false;
                for (const key in data) {
                    if (!isRenderedModule(key)) {
                        fullInvoke = true;
                        invokeCreateHooks(vnode, insertedVnodeQueue);
                        break
                    }
                }
                if (!fullInvoke && data['class']) {
                    // ensure collecting deps for deep class bindings for future updates
                    traverse(data['class']);
                }
            }
        } else if (elm.data !== vnode.text) {
            elm.data = vnode.text;
        }
        return true
    }

    function assertNodeMatch(node, vnode, inVPre) {
        if (isDef(vnode.tag)) {
            return vnode.tag.indexOf('vue-component') === 0 || (
                !isUnknownElement$$1(vnode, inVPre) &&
                vnode.tag.toLowerCase() === (node.tagName && node.tagName.toLowerCase())
            )
        } else {
            return node.nodeType === (vnode.isComment ? 8 : 3)
        }
    }

    return function patch(oldVnode, vnode, hydrating, removeOnly, parentElm, refElm) {
        if (isUndef(vnode)) {
            if (isDef(oldVnode)) invokeDestroyHook(oldVnode);
            return
        }

        let isInitialPatch = false;
        const insertedVnodeQueue = [];

        if (isUndef(oldVnode)) {
            // empty mount (likely as component), create new root element
            isInitialPatch = true;
            createElm(vnode, insertedVnodeQueue, parentElm, refElm);
        } else {
            const isRealElement = isDef(oldVnode.nodeType);
            if (!isRealElement && sameVnode(oldVnode, vnode)) {
                // patch existing root node
                patchVnode(oldVnode, vnode, insertedVnodeQueue, removeOnly);
            } else {
                if (isRealElement) {
                    // mounting to a real element
                    // check if this is server-rendered content and if we can perform
                    // a successful hydration.
                    if (oldVnode.nodeType === 1 && oldVnode.hasAttribute(SSR_ATTR)) {
                        oldVnode.removeAttribute(SSR_ATTR);
                        hydrating = true;
                    }
                    if (isTrue(hydrating)) {
                        if (hydrate(oldVnode, vnode, insertedVnodeQueue)) {
                            invokeInsertHook(vnode, insertedVnodeQueue, true);
                            return oldVnode
                        } else {
                            warn(
                                'The client-side rendered virtual DOM tree is not matching ' +
                                'server-rendered content. This is likely caused by incorrect ' +
                                'HTML markup, for example nesting block-level elements inside ' +
                                '<p>, or missing <tbody>. Bailing hydration and performing ' +
                                'full client-side render.'
                            );
                        }
                    }
                    // either not server-rendered, or hydration failed.
                    // create an empty node and replace it
                    oldVnode = emptyNodeAt(oldVnode);
                }

                // replacing existing element
                const oldElm = oldVnode.elm;
                const parentElm = nodeOps.parentNode(oldElm);

                // create new node
                createElm(
                    vnode,
                    insertedVnodeQueue,
                    // extremely rare edge case: do not insert if old element is in a
                    // leaving transition. Only happens when combining transition +
                    // keep-alive + HOCs. (#4590)
                    oldElm._leaveCb ? null : parentElm,
                    nodeOps.nextSibling(oldElm)
                );

                // update parent placeholder node element, recursively
                if (isDef(vnode.parent)) {
                    let ancestor = vnode.parent;
                    const patchable = isPatchable(vnode);
                    while (ancestor) {
                        for (let i = 0; i < cbs.destroy.length; ++i) {
                            cbs.destroy[i](ancestor);
                        }
                        ancestor.elm = vnode.elm;
                        if (patchable) {
                            for (let i = 0; i < cbs.create.length; ++i) {
                                cbs.create[i](emptyNode, ancestor);
                            }
                            // #6513
                            // invoke insert hooks that may have been merged by create hooks.
                            // e.g. for directives that uses the "inserted" hook.
                            const insert = ancestor.data.hook.insert;
                            if (insert.merged) {
                                // start at index 1 to avoid re-invoking component mounted hook
                                for (let i = 1; i < insert.fns.length; i++) {
                                    insert.fns[i]();
                                }
                            }
                        } else {
                            registerRef(ancestor);
                        }
                        ancestor = ancestor.parent;
                    }
                }

                // destroy old node
                if (isDef(parentElm)) {
                    removeVnodes(parentElm, [oldVnode], 0, 0);
                } else if (isDef(oldVnode.tag)) {
                    invokeDestroyHook(oldVnode);
                }
            }
        }

        invokeInsertHook(vnode, insertedVnodeQueue, isInitialPatch);
        return vnode.elm
    }
}

/*  */

var directives = {
    create: updateDirectives,
    update: updateDirectives,
    destroy: function unbindDirectives(vnode) {
        updateDirectives(vnode, emptyNode);
    }
};

function updateDirectives(oldVnode, vnode) {
    if (oldVnode.data.directives || vnode.data.directives) {
        _update(oldVnode, vnode);
    }
}

function _update(oldVnode, vnode) {
    const isCreate = oldVnode === emptyNode;
    const isDestroy = vnode === emptyNode;
    const oldDirs = normalizeDirectives$1(oldVnode.data.directives, oldVnode.context);
    const newDirs = normalizeDirectives$1(vnode.data.directives, vnode.context);

    const dirsWithInsert = [];
    const dirsWithPostpatch = [];

    let key, oldDir, dir;
    for (key in newDirs) {
        oldDir = oldDirs[key];
        dir = newDirs[key];
        if (!oldDir) {
            // new directive, bind
            callHook$1(dir, 'bind', vnode, oldVnode);
            if (dir.def && dir.def.inserted) {
                dirsWithInsert.push(dir);
            }
        } else {
            // existing directive, update
            dir.oldValue = oldDir.value;
            callHook$1(dir, 'update', vnode, oldVnode);
            if (dir.def && dir.def.componentUpdated) {
                dirsWithPostpatch.push(dir);
            }
        }
    }

    if (dirsWithInsert.length) {
        const callInsert = () =
    >
        {
            for (let i = 0; i < dirsWithInsert.length; i++) {
                callHook$1(dirsWithInsert[i], 'inserted', vnode, oldVnode);
            }
        }
        ;
        if (isCreate) {
            mergeVNodeHook(vnode, 'insert', callInsert);
        } else {
            callInsert();
        }
    }

    if (dirsWithPostpatch.length) {
        mergeVNodeHook(vnode, 'postpatch', () = > {
            for(let i = 0;
        i < dirsWithPostpatch.length;
        i++
    )
        {
            callHook$1(dirsWithPostpatch[i], 'componentUpdated', vnode, oldVnode);
        }
    })
        ;
    }

    if (!isCreate) {
        for (key in oldDirs) {
            if (!newDirs[key]) {
                // no longer present, unbind
                callHook$1(oldDirs[key], 'unbind', oldVnode, oldVnode, isDestroy);
            }
        }
    }
}

const emptyModifiers = Object.create(null);

function normalizeDirectives$1(
    dirs,
    vm
) {
    const res = Object.create(null);
    if (!dirs) {
        return res
    }
    let i, dir;
    for (i = 0; i < dirs.length; i++) {
        dir = dirs[i];
        if (!dir.modifiers) {
            dir.modifiers = emptyModifiers;
        }
        res[getRawDirName(dir)] = dir;
        dir.def = resolveAsset(vm.$options, 'directives', dir.name, true);
    }
    return res
}

function getRawDirName(dir) {
    return dir.rawName || `${dir.name}.${Object.keys(dir.modifiers || {}).join('.')}`
}

function callHook$1(dir, hook, vnode, oldVnode, isDestroy) {
    const fn = dir.def && dir.def[hook];
    if (fn) {
        try {
            fn(vnode.elm, dir, vnode, oldVnode, isDestroy);
        } catch (e) {
            handleError(e, vnode.context, `directive ${dir.name} ${hook} hook`);
        }
    }
}

var baseModules = [
    ref,
    directives
];

/*  */

function updateAttrs(oldVnode, vnode) {
    const opts = vnode.componentOptions;
    if (isDef(opts) && opts.Ctor.options.inheritAttrs === false) {
        return
    }
    if (isUndef(oldVnode.data.attrs) && isUndef(vnode.data.attrs)) {
        return
    }
    let key, cur, old;
    const elm = vnode.elm;
    const oldAttrs = oldVnode.data.attrs || {};
    let attrs = vnode.data.attrs || {};
    // clone observed objects, as the user probably wants to mutate it
    if (isDef(attrs.__ob__)) {
        attrs = vnode.data.attrs = extend({}, attrs);
    }

    for (key in attrs) {
        cur = attrs[key];
        old = oldAttrs[key];
        if (old !== cur) {
            setAttr(elm, key, cur);
        }
    }
    // #4391: in IE9, setting type can reset value for input[type=radio]
    // #6666: IE/Edge forces progress value down to 1 before setting a max
    /* istanbul ignore if */
    if ((isIE9 || isEdge) && attrs.value !== oldAttrs.value) {
        setAttr(elm, 'value', attrs.value);
    }
    for (key in oldAttrs) {
        if (isUndef(attrs[key])) {
            if (isXlink(key)) {
                elm.removeAttributeNS(xlinkNS, getXlinkProp(key));
            } else if (!isEnumeratedAttr(key)) {
                elm.removeAttribute(key);
            }
        }
    }
}

function setAttr(el, key, value) {
    if (isBooleanAttr(key)) {
        // set attribute for blank value
        // e.g. <option disabled>Select one</option>
        if (isFalsyAttrValue(value)) {
            el.removeAttribute(key);
        } else {
            // technically allowfullscreen is a boolean attribute for <iframe>,
            // but Flash expects a value of "true" when used on <embed> tag
            value = key === 'allowfullscreen' && el.tagName === 'EMBED'
                ? 'true'
                : key;
            el.setAttribute(key, value);
        }
    } else if (isEnumeratedAttr(key)) {
        el.setAttribute(key, isFalsyAttrValue(value) || value === 'false' ? 'false' : 'true');
    } else if (isXlink(key)) {
        if (isFalsyAttrValue(value)) {
            el.removeAttributeNS(xlinkNS, getXlinkProp(key));
        } else {
            el.setAttributeNS(xlinkNS, key, value);
        }
    } else {
        if (isFalsyAttrValue(value)) {
            el.removeAttribute(key);
        } else {
            el.setAttribute(key, value);
        }
    }
}

var attrs = {
    create: updateAttrs,
    update: updateAttrs
};

/*  */

function updateClass(oldVnode, vnode) {
    const el = vnode.elm;
    const data = vnode.data;
    const oldData = oldVnode.data;
    if (
        isUndef(data.staticClass) &&
        isUndef(data.class) && (
            isUndef(oldData) || (
                isUndef(oldData.staticClass) &&
                isUndef(oldData.class)
            )
        )
    ) {
        return
    }

    let cls = genClassForVnode(vnode);

    // handle transition classes
    const transitionClass = el._transitionClasses;
    if (isDef(transitionClass)) {
        cls = concat(cls, stringifyClass(transitionClass));
    }

    // set the class
    if (cls !== el._prevClass) {
        el.setAttribute('class', cls);
        el._prevClass = cls;
    }
}

var klass = {
    create: updateClass,
    update: updateClass
};

/*  */

const validDivisionCharRE = /[\w).+\-_$\]]/;

function parseFilters(exp) {
    let inSingle = false;
    let inDouble = false;
    let inTemplateString = false;
    let inRegex = false;
    let curly = 0;
    let square = 0;
    let paren = 0;
    let lastFilterIndex = 0;
    let c, prev, i, expression, filters;

    for (i = 0; i < exp.length; i++) {
        prev = c;
        c = exp.charCodeAt(i);
        if (inSingle) {
            if (c === 0x27 && prev !== 0x5C) inSingle = false;
        } else if (inDouble) {
            if (c === 0x22 && prev !== 0x5C) inDouble = false;
        } else if (inTemplateString) {
            if (c === 0x60 && prev !== 0x5C) inTemplateString = false;
        } else if (inRegex) {
            if (c === 0x2f && prev !== 0x5C) inRegex = false;
        } else if (
            c === 0x7C && // pipe
            exp.charCodeAt(i + 1) !== 0x7C &&
            exp.charCodeAt(i - 1) !== 0x7C &&
            !curly && !square && !paren
        ) {
            if (expression === undefined) {
                // first filter, end of expression
                lastFilterIndex = i + 1;
                expression = exp.slice(0, i).trim();
            } else {
                pushFilter();
            }
        } else {
            switch (c) {
                case 0x22:
                    inDouble = true;
                    break         // "
                case 0x27:
                    inSingle = true;
                    break         // '
                case 0x60:
                    inTemplateString = true;
                    break // `
                case 0x28:
                    paren++;
                    break                 // (
                case 0x29:
                    paren--;
                    break                 // )
                case 0x5B:
                    square++;
                    break                // [
                case 0x5D:
                    square--;
                    break                // ]
                case 0x7B:
                    curly++;
                    break                 // {
                case 0x7D:
                    curly--;
                    break                 // }
            }
            if (c === 0x2f) { // /
                let j = i - 1;
                let p;
                // find first non-whitespace prev char
                for (; j >= 0; j--) {
                    p = exp.charAt(j);
                    if (p !== ' ') break
                }
                if (!p || !validDivisionCharRE.test(p)) {
                    inRegex = true;
                }
            }
        }
    }

    if (expression === undefined) {
        expression = exp.slice(0, i).trim();
    } else if (lastFilterIndex !== 0) {
        pushFilter();
    }

    function pushFilter() {
        (filters || (filters = [])).push(exp.slice(lastFilterIndex, i).trim());
        lastFilterIndex = i + 1;
    }

    if (filters) {
        for (i = 0; i < filters.length; i++) {
            expression = wrapFilter(expression, filters[i]);
        }
    }

    return expression
}

function wrapFilter(exp, filter) {
    const i = filter.indexOf('(');
    if (i < 0) {
        // _f: resolveFilter
        return `_f("${filter}")(${exp})`
    } else {
        const name = filter.slice(0, i);
        const args = filter.slice(i + 1);
        return `_f("${name}")(${exp},${args}`
    }
}

/*  */

function baseWarn(msg) {
    console.error(`[Vue compiler]: ${msg}`);
}

function pluckModuleFunction(
    modules,
    key
) {
    return modules
        ? modules.map(m = > m[key]
).
    filter(_ = > _
)
:
    []
}

function addProp(el, name, value) {
    (el.props || (el.props = [])).push({name, value});
}

function addAttr(el, name, value) {
    (el.attrs || (el.attrs = [])).push({name, value});
}

function addDirective(
    el,
    name,
    rawName,
    value,
    arg,
    modifiers
) {
    (el.directives || (el.directives = [])).push({name, rawName, value, arg, modifiers});
}

function addHandler(
    el,
    name,
    value,
    modifiers,
    important,
    warn
) {
    modifiers = modifiers || emptyObject;
    // warn prevent and passive modifier
    /* istanbul ignore if */
    if (
        "development" !== 'production' && warn &&
        modifiers.prevent && modifiers.passive
    ) {
        warn(
            'passive and prevent can\'t be used together. ' +
            'Passive handler can\'t prevent default event.'
        );
    }

    // check capture modifier
    if (modifiers.capture) {
        delete modifiers.capture;
        name = '!' + name; // mark the event as captured
    }
    if (modifiers.once) {
        delete modifiers.once;
        name = '~' + name; // mark the event as once
    }
    /* istanbul ignore if */
    if (modifiers.passive) {
        delete modifiers.passive;
        name = '&' + name; // mark the event as passive
    }

    // normalize click.right and click.middle since they don't actually fire
    // this is technically browser-specific, but at least for now browsers are
    // the only target envs that have right/middle clicks.
    if (name === 'click') {
        if (modifiers.right) {
            name = 'contextmenu';
            delete modifiers.right;
        } else if (modifiers.middle) {
            name = 'mouseup';
        }
    }

    let events;
    if (modifiers.native) {
        delete modifiers.native;
        events = el.nativeEvents || (el.nativeEvents = {});
    } else {
        events = el.events || (el.events = {});
    }

    const newHandler = {value};
    if (modifiers !== emptyObject) {
        newHandler.modifiers = modifiers;
    }

    const handlers = events[name];
    /* istanbul ignore if */
    if (Array.isArray(handlers)) {
        important ? handlers.unshift(newHandler) : handlers.push(newHandler);
    } else if (handlers) {
        events[name] = important ? [newHandler, handlers] : [handlers, newHandler];
    } else {
        events[name] = newHandler;
    }
}

function getBindingAttr(
    el,
    name,
    getStatic
) {
    const dynamicValue =
        getAndRemoveAttr(el, ':' + name) ||
        getAndRemoveAttr(el, 'v-bind:' + name);
    if (dynamicValue != null) {
        return parseFilters(dynamicValue)
    } else if (getStatic !== false) {
        const staticValue = getAndRemoveAttr(el, name);
        if (staticValue != null) {
            return JSON.stringify(staticValue)
        }
    }
}

// note: this only removes the attr from the Array (attrsList) so that it
// doesn't get processed by processAttrs.
// By default it does NOT remove it from the map (attrsMap) because the map is
// needed during codegen.
function getAndRemoveAttr(
    el,
    name,
    removeFromMap
) {
    let val;
    if ((val = el.attrsMap[name]) != null) {
        const list = el.attrsList;
        for (let i = 0, l = list.length; i < l; i++) {
            if (list[i].name === name) {
                list.splice(i, 1);
                break
            }
        }
    }
    if (removeFromMap) {
        delete el.attrsMap[name];
    }
    return val
}

/*  */

/**
 * Cross-platform code generation for component v-model
 */
function genComponentModel(
    el,
    value,
    modifiers
) {
    const {number, trim} = modifiers || {};

    const baseValueExpression = '$$v';
    let valueExpression = baseValueExpression;
    if (trim) {
        valueExpression =
            `(typeof ${baseValueExpression} === 'string'` +
            `? ${baseValueExpression}.trim()` +
            `: ${baseValueExpression})`;
    }
    if (number) {
        valueExpression = `_n(${valueExpression})`;
    }
    const assignment = genAssignmentCode(value, valueExpression);

    el.model = {
        value: `(${value})`,
        expression: `"${value}"`,
        callback: `function (${baseValueExpression}) {${assignment}}`
    };
}

/**
 * Cross-platform codegen helper for generating v-model value assignment code.
 */
function genAssignmentCode(
    value,
    assignment
) {
    const res = parseModel(value);
    if (res.key === null) {
        return `${value}=${assignment}`
    } else {
        return `$set(${res.exp}, ${res.key}, ${assignment})`
    }
}

/**
 * Parse a v-model expression into a base path and a final key segment.
 * Handles both dot-path and possible square brackets.
 *
 * Possible cases:
 *
 * - test
 * - test[key]
 * - test[test1[key]]
 * - test["a"][key]
 * - xxx.test[a[a].test1[key]]
 * - test.xxx.a["asa"][test1[key]]
 *
 */

let len;
let str;
let chr;
let index$1;
let expressionPos;
let expressionEndPos;


function parseModel(val) {
    len = val.length;

    if (val.indexOf('[') < 0 || val.lastIndexOf(']') < len - 1) {
        index$1 = val.lastIndexOf('.');
        if (index$1 > -1) {
            return {
                exp: val.slice(0, index$1),
                key: '"' + val.slice(index$1 + 1) + '"'
            }
        } else {
            return {
                exp: val,
                key: null
            }
        }
    }

    str = val;
    index$1 = expressionPos = expressionEndPos = 0;

    while (!eof()) {
        chr = next();
        /* istanbul ignore if */
        if (isStringStart(chr)) {
            parseString(chr);
        } else if (chr === 0x5B) {
            parseBracket(chr);
        }
    }

    return {
        exp: val.slice(0, expressionPos),
        key: val.slice(expressionPos + 1, expressionEndPos)
    }
}

function next() {
    return str.charCodeAt(++index$1)
}

function eof() {
    return index$1 >= len
}

function isStringStart(chr) {
    return chr === 0x22 || chr === 0x27
}

function parseBracket(chr) {
    let inBracket = 1;
    expressionPos = index$1;
    while (!eof()) {
        chr = next();
        if (isStringStart(chr)) {
            parseString(chr);
            continue
        }
        if (chr === 0x5B) inBracket++;
        if (chr === 0x5D) inBracket--;
        if (inBracket === 0) {
            expressionEndPos = index$1;
            break
        }
    }
}

function parseString(chr) {
    const stringQuote = chr;
    while (!eof()) {
        chr = next();
        if (chr === stringQuote) {
            break
        }
    }
}

/*  */

let warn$1;

// in some cases, the event used has to be determined at runtime
// so we used some reserved tokens during compile.
const RANGE_TOKEN = '__r';
const CHECKBOX_RADIO_TOKEN = '__c';

function model(
    el,
    dir,
    _warn
) {
    warn$1 = _warn;
    const value = dir.value;
    const modifiers = dir.modifiers;
    const tag = el.tag;
    const type = el.attrsMap.type;

    {
        // inputs with type="file" are read only and setting the input's
        // value will throw an error.
        if (tag === 'input' && type === 'file') {
            warn$1(
                `<${el.tag} v-model="${value}" type="file">:\n` +
                `File inputs are read only. Use a v-on:change listener instead.`
            );
        }
    }

    if (el.component) {
        genComponentModel(el, value, modifiers);
        // component v-model doesn't need extra runtime
        return false
    } else if (tag === 'select') {
        genSelect(el, value, modifiers);
    } else if (tag === 'input' && type === 'checkbox') {
        genCheckboxModel(el, value, modifiers);
    } else if (tag === 'input' && type === 'radio') {
        genRadioModel(el, value, modifiers);
    } else if (tag === 'input' || tag === 'textarea') {
        genDefaultModel(el, value, modifiers);
    } else if (!config.isReservedTag(tag)) {
        genComponentModel(el, value, modifiers);
        // component v-model doesn't need extra runtime
        return false
    } else {
        warn$1(
            `<${el.tag} v-model="${value}">: ` +
            `v-model is not supported on this element type. ` +
            'If you are working with contenteditable, it\'s recommended to ' +
            'wrap a library dedicated for that purpose inside a custom component.'
        );
    }

    // ensure runtime directive metadata
    return true
}

function genCheckboxModel(
    el,
    value,
    modifiers
) {
    const number = modifiers && modifiers.number;
    const valueBinding = getBindingAttr(el, 'value') || 'null';
    const trueValueBinding = getBindingAttr(el, 'true-value') || 'true';
    const falseValueBinding = getBindingAttr(el, 'false-value') || 'false';
    addProp(el, 'checked',
        `Array.isArray(${value})` +
        `?_i(${value},${valueBinding})>-1` + (
            trueValueBinding === 'true'
                ? `:(${value})`
                : `:_q(${value},${trueValueBinding})`
        )
    );
    addHandler(el, 'change',
        `var $$a=${value},` +
        '$$el=$event.target,' +
        `$$c=$$el.checked?(${trueValueBinding}):(${falseValueBinding});` +
        'if(Array.isArray($$a)){' +
        `var $$v=${number ? '_n(' + valueBinding + ')' : valueBinding},` +
        '$$i=_i($$a,$$v);' +
        `if($$el.checked){$$i<0&&(${value}=$$a.concat([$$v]))}` +
        `else{$$i>-1&&(${value}=$$a.slice(0,$$i).concat($$a.slice($$i+1)))}` +
        `}else{${genAssignmentCode(value, '$$c')}}`,
        null, true
    );
}

function genRadioModel(
    el,
    value,
    modifiers
) {
    const number = modifiers && modifiers.number;
    let valueBinding = getBindingAttr(el, 'value') || 'null';
    valueBinding = number ? `_n(${valueBinding})` : valueBinding;
    addProp(el, 'checked', `_q(${value},${valueBinding})`);
    addHandler(el, 'change', genAssignmentCode(value, valueBinding), null, true);
}

function genSelect(
    el,
    value,
    modifiers
) {
    const number = modifiers && modifiers.number;
    const selectedVal = `Array.prototype.filter` +
        `.call($event.target.options,function(o){return o.selected})` +
        `.map(function(o){var val = "_value" in o ? o._value : o.value;` +
        `return ${number ? '_n(val)' : 'val'}})`;

    const assignment = '$event.target.multiple ? $$selectedVal : $$selectedVal[0]';
    let code = `var $$selectedVal = ${selectedVal};`;
    code = `${code} ${genAssignmentCode(value, assignment)}`;
    addHandler(el, 'change', code, null, true);
}

function genDefaultModel(
    el,
    value,
    modifiers
) {
    const type = el.attrsMap.type;

    // warn if v-bind:value conflicts with v-model
    {
        const value = el.attrsMap['v-bind:value'] || el.attrsMap[':value'];
        if (value) {
            const binding = el.attrsMap['v-bind:value'] ? 'v-bind:value' : ':value';
            warn$1(
                `${binding}="${value}" conflicts with v-model on the same element ` +
                'because the latter already expands to a value binding internally'
            );
        }
    }

    const {lazy, number, trim} = modifiers || {};
    const needCompositionGuard = !lazy && type !== 'range';
    const event = lazy
        ? 'change'
        : type === 'range'
            ? RANGE_TOKEN
            : 'input';

    let valueExpression = '$event.target.value';
    if (trim) {
        valueExpression = `$event.target.value.trim()`;
    }
    if (number) {
        valueExpression = `_n(${valueExpression})`;
    }

    let code = genAssignmentCode(value, valueExpression);
    if (needCompositionGuard) {
        code = `if($event.target.composing)return;${code}`;
    }

    addProp(el, 'value', `(${value})`);
    addHandler(el, event, code, null, true);
    if (trim || number) {
        addHandler(el, 'blur', '$forceUpdate()');
    }
}

/*  */

// normalize v-model event tokens that can only be determined at runtime.
// it's important to place the event as the first in the array because
// the whole point is ensuring the v-model callback gets called before
// user-attached handlers.
function normalizeEvents(on) {
    /* istanbul ignore if */
    if (isDef(on[RANGE_TOKEN])) {
        // IE input[type=range] only supports `change` event
        const event = isIE ? 'change' : 'input';
        on[event] = [].concat(on[RANGE_TOKEN], on[event] || []);
        delete on[RANGE_TOKEN];
    }
    // This was originally intended to fix #4521 but no longer necessary
    // after 2.5. Keeping it for backwards compat with generated code from < 2.4
    /* istanbul ignore if */
    if (isDef(on[CHECKBOX_RADIO_TOKEN])) {
        on.change = [].concat(on[CHECKBOX_RADIO_TOKEN], on.change || []);
        delete on[CHECKBOX_RADIO_TOKEN];
    }
}

let target$1;

function createOnceHandler(handler, event, capture) {
    const _target = target$1; // save current target element in closure
    return function onceHandler() {
        const res = handler.apply(null, arguments);
        if (res !== null) {
            remove$2(event, onceHandler, capture, _target);
        }
    }
}

function add$1(
    event,
    handler,
    once$$1,
    capture,
    passive
) {
    handler = withMacroTask(handler);
    if (once$$1) handler = createOnceHandler(handler, event, capture);
    target$1.addEventListener(
        event,
        handler,
        supportsPassive
            ? {capture, passive}
            : capture
    );
}

function remove$2(
    event,
    handler,
    capture,
    _target
) {
    (_target || target$1).removeEventListener(
        event,
        handler._withTask || handler,
        capture
    );
}

function updateDOMListeners(oldVnode, vnode) {
    if (isUndef(oldVnode.data.on) && isUndef(vnode.data.on)) {
        return
    }
    const on = vnode.data.on || {};
    const oldOn = oldVnode.data.on || {};
    target$1 = vnode.elm;
    normalizeEvents(on);
    updateListeners(on, oldOn, add$1, remove$2, vnode.context);
    target$1 = undefined;
}

var events = {
    create: updateDOMListeners,
    update: updateDOMListeners
};

/*  */

function updateDOMProps(oldVnode, vnode) {
    if (isUndef(oldVnode.data.domProps) && isUndef(vnode.data.domProps)) {
        return
    }
    let key, cur;
    const elm = vnode.elm;
    const oldProps = oldVnode.data.domProps || {};
    let props = vnode.data.domProps || {};
    // clone observed objects, as the user probably wants to mutate it
    if (isDef(props.__ob__)) {
        props = vnode.data.domProps = extend({}, props);
    }

    for (key in oldProps) {
        if (isUndef(props[key])) {
            elm[key] = '';
        }
    }
    for (key in props) {
        cur = props[key];
        // ignore children if the node has textContent or innerHTML,
        // as these will throw away existing DOM nodes and cause removal errors
        // on subsequent patches (#3360)
        if (key === 'textContent' || key === 'innerHTML') {
            if (vnode.children) vnode.children.length = 0;
            if (cur === oldProps[key]) continue
            // #6601 work around Chrome version <= 55 bug where single textNode
            // replaced by innerHTML/textContent retains its parentNode property
            if (elm.childNodes.length === 1) {
                elm.removeChild(elm.childNodes[0]);
            }
        }

        if (key === 'value') {
            // store value as _value as well since
            // non-string values will be stringified
            elm._value = cur;
            // avoid resetting cursor position when value is the same
            const strCur = isUndef(cur) ? '' : String(cur);
            if (shouldUpdateValue(elm, strCur)) {
                elm.value = strCur;
            }
        } else {
            elm[key] = cur;
        }
    }
}

// check platforms/web/util/attrs.js acceptValue


function shouldUpdateValue(elm, checkVal) {
    return (!elm.composing && (
        elm.tagName === 'OPTION' ||
        isDirty(elm, checkVal) ||
        isInputChanged(elm, checkVal)
    ))
}

function isDirty(elm, checkVal) {
    // return true when textbox (.number and .trim) loses focus and its value is
    // not equal to the updated value
    let notInFocus = true;
    // #6157
    // work around IE bug when accessing document.activeElement in an iframe
    try {
        notInFocus = document.activeElement !== elm;
    } catch (e) {
    }
    return notInFocus && elm.value !== checkVal
}

function isInputChanged(elm, newVal) {
    const value = elm.value;
    const modifiers = elm._vModifiers; // injected by v-model runtime
    if (isDef(modifiers) && modifiers.number) {
        return toNumber(value) !== toNumber(newVal)
    }
    if (isDef(modifiers) && modifiers.trim) {
        return value.trim() !== newVal.trim()
    }
    return value !== newVal
}

var domProps = {
    create: updateDOMProps,
    update: updateDOMProps
};

/*  */

const parseStyleText = cached(function (cssText) {
    const res = {};
    const listDelimiter = /;(?![^(]*\))/g;
    const propertyDelimiter = /:(.+)/;
    cssText.split(listDelimiter).forEach(function (item) {
        if (item) {
            var tmp = item.split(propertyDelimiter);
            tmp.length > 1 && (res[tmp[0].trim()] = tmp[1].trim());
        }
    });
    return res
});

// merge static and dynamic style data on the same vnode
function normalizeStyleData(data) {
    const style = normalizeStyleBinding(data.style);
    // static style is pre-processed into an object during compilation
    // and is always a fresh object, so it's safe to merge into it
    return data.staticStyle
        ? extend(data.staticStyle, style)
        : style
}

// normalize possible array / string values into Object
function normalizeStyleBinding(bindingStyle) {
    if (Array.isArray(bindingStyle)) {
        return toObject(bindingStyle)
    }
    if (typeof bindingStyle === 'string') {
        return parseStyleText(bindingStyle)
    }
    return bindingStyle
}

/**
 * parent component style should be after child's
 * so that parent component's style could override it
 */
function getStyle(vnode, checkChild) {
    const res = {};
    let styleData;

    if (checkChild) {
        let childNode = vnode;
        while (childNode.componentInstance) {
            childNode = childNode.componentInstance._vnode;
            if (childNode.data && (styleData = normalizeStyleData(childNode.data))) {
                extend(res, styleData);
            }
        }
    }

    if ((styleData = normalizeStyleData(vnode.data))) {
        extend(res, styleData);
    }

    let parentNode = vnode;
    while ((parentNode = parentNode.parent)) {
        if (parentNode.data && (styleData = normalizeStyleData(parentNode.data))) {
            extend(res, styleData);
        }
    }
    return res
}

/*  */

const cssVarRE = /^--/;
const importantRE = /\s*!important$/;
const setProp = (el, name, val) =
>
{
    /* istanbul ignore if */
    if (cssVarRE.test(name)) {
        el.style.setProperty(name, val);
    } else if (importantRE.test(val)) {
        el.style.setProperty(name, val.replace(importantRE, ''), 'important');
    } else {
        const normalizedName = normalize(name);
        if (Array.isArray(val)) {
            // Support values array created by autoprefixer, e.g.
            // {display: ["-webkit-box", "-ms-flexbox", "flex"]}
            // Set them one by one, and the browser will only set those it can recognize
            for (let i = 0, len = val.length; i < len; i++) {
                el.style[normalizedName] = val[i];
            }
        } else {
            el.style[normalizedName] = val;
        }
    }
}
;

const vendorNames = ['Webkit', 'Moz', 'ms'];

let emptyStyle;
const normalize = cached(function (prop) {
    emptyStyle = emptyStyle || document.createElement('div').style;
    prop = camelize(prop);
    if (prop !== 'filter' && (prop in emptyStyle)) {
        return prop
    }
    const capName = prop.charAt(0).toUpperCase() + prop.slice(1);
    for (let i = 0; i < vendorNames.length; i++) {
        const name = vendorNames[i] + capName;
        if (name in emptyStyle) {
            return name
        }
    }
});

function updateStyle(oldVnode, vnode) {
    const data = vnode.data;
    const oldData = oldVnode.data;

    if (isUndef(data.staticStyle) && isUndef(data.style) &&
        isUndef(oldData.staticStyle) && isUndef(oldData.style)
    ) {
        return
    }

    let cur, name;
    const el = vnode.elm;
    const oldStaticStyle = oldData.staticStyle;
    const oldStyleBinding = oldData.normalizedStyle || oldData.style || {};

    // if static style exists, stylebinding already merged into it when doing normalizeStyleData
    const oldStyle = oldStaticStyle || oldStyleBinding;

    const style = normalizeStyleBinding(vnode.data.style) || {};

    // store normalized style under a different key for next diff
    // make sure to clone it if it's reactive, since the user likely wants
    // to mutate it.
    vnode.data.normalizedStyle = isDef(style.__ob__)
        ? extend({}, style)
        : style;

    const newStyle = getStyle(vnode, true);

    for (name in oldStyle) {
        if (isUndef(newStyle[name])) {
            setProp(el, name, '');
        }
    }
    for (name in newStyle) {
        cur = newStyle[name];
        if (cur !== oldStyle[name]) {
            // ie9 setting to null has no effect, must use empty string
            setProp(el, name, cur == null ? '' : cur);
        }
    }
}

var style = {
    create: updateStyle,
    update: updateStyle
};

/*  */

/**
 * Add class with compatibility for SVG since classList is not supported on
 * SVG elements in IE
 */
function addClass(el, cls) {
    /* istanbul ignore if */
    if (!cls || !(cls = cls.trim())) {
        return
    }

    /* istanbul ignore else */
    if (el.classList) {
        if (cls.indexOf(' ') > -1) {
            cls.split(/\s+/).forEach(c = > el.classList.add(c)
        )
            ;
        } else {
            el.classList.add(cls);
        }
    } else {
        const cur = ` ${el.getAttribute('class') || ''} `;
        if (cur.indexOf(' ' + cls + ' ') < 0) {
            el.setAttribute('class', (cur + cls).trim());
        }
    }
}

/**
 * Remove class with compatibility for SVG since classList is not supported on
 * SVG elements in IE
 */
function removeClass(el, cls) {
    /* istanbul ignore if */
    if (!cls || !(cls = cls.trim())) {
        return
    }

    /* istanbul ignore else */
    if (el.classList) {
        if (cls.indexOf(' ') > -1) {
            cls.split(/\s+/).forEach(c = > el.classList.remove(c)
        )
            ;
        } else {
            el.classList.remove(cls);
        }
        if (!el.classList.length) {
            el.removeAttribute('class');
        }
    } else {
        let cur = ` ${el.getAttribute('class') || ''} `;
        const tar = ' ' + cls + ' ';
        while (cur.indexOf(tar) >= 0) {
            cur = cur.replace(tar, ' ');
        }
        cur = cur.trim();
        if (cur) {
            el.setAttribute('class', cur);
        } else {
            el.removeAttribute('class');
        }
    }
}

/*  */

function resolveTransition(def) {
    if (!def) {
        return
    }
    /* istanbul ignore else */
    if (typeof def === 'object') {
        const res = {};
        if (def.css !== false) {
            extend(res, autoCssTransition(def.name || 'v'));
        }
        extend(res, def);
        return res
    } else if (typeof def === 'string') {
        return autoCssTransition(def)
    }
}

const autoCssTransition = cached(name = > {
    return {
        enterClass: `${name}-enter`,
        enterToClass: `${name}-enter-to`,
        enterActiveClass: `${name}-enter-active`,
        leaveClass: `${name}-leave`,
        leaveToClass: `${name}-leave-to`,
        leaveActiveClass: `${name}-leave-active`
    }
}
)
;

const hasTransition = inBrowser && !isIE9;
const TRANSITION = 'transition';
const ANIMATION = 'animation';

// Transition property/event sniffing
let transitionProp = 'transition';
let transitionEndEvent = 'transitionend';
let animationProp = 'animation';
let animationEndEvent = 'animationend';
if (hasTransition) {
    /* istanbul ignore if */
    if (window.ontransitionend === undefined &&
        window.onwebkittransitionend !== undefined
    ) {
        transitionProp = 'WebkitTransition';
        transitionEndEvent = 'webkitTransitionEnd';
    }
    if (window.onanimationend === undefined &&
        window.onwebkitanimationend !== undefined
    ) {
        animationProp = 'WebkitAnimation';
        animationEndEvent = 'webkitAnimationEnd';
    }
}

// binding to window is necessary to make hot reload work in IE in strict mode
const raf = inBrowser
    ? window.requestAnimationFrame
        ? window.requestAnimationFrame.bind(window)
        : setTimeout
    : /* istanbul ignore next */ fn =
>
fn();

function nextFrame(fn) {
    raf(() = > {
        raf(fn);
})
    ;
}

function addTransitionClass(el, cls) {
    const transitionClasses = el._transitionClasses || (el._transitionClasses = []);
    if (transitionClasses.indexOf(cls) < 0) {
        transitionClasses.push(cls);
        addClass(el, cls);
    }
}

function removeTransitionClass(el, cls) {
    if (el._transitionClasses) {
        remove(el._transitionClasses, cls);
    }
    removeClass(el, cls);
}

function whenTransitionEnds(
    el,
    expectedType,
    cb
) {
    const {type, timeout, propCount} = getTransitionInfo(el, expectedType);
    if (!type) return cb()
    const event = type === TRANSITION ? transitionEndEvent : animationEndEvent;
    let ended = 0;
    const end = () =
>
    {
        el.removeEventListener(event, onEnd);
        cb();
    }
    ;
    const onEnd = e =
>
    {
        if (e.target === el) {
            if (++ended >= propCount) {
                end();
            }
        }
    }
    ;
    setTimeout(() = > {
        if(ended < propCount
)
    {
        end();
    }
},
    timeout + 1
)
    ;
    el.addEventListener(event, onEnd);
}

const transformRE = /\b(transform|all)(,|$)/;

function getTransitionInfo(el, expectedType) {
    const styles = window.getComputedStyle(el);
    const transitionDelays = styles[transitionProp + 'Delay'].split(', ');
    const transitionDurations = styles[transitionProp + 'Duration'].split(', ');
    const transitionTimeout = getTimeout(transitionDelays, transitionDurations);
    const animationDelays = styles[animationProp + 'Delay'].split(', ');
    const animationDurations = styles[animationProp + 'Duration'].split(', ');
    const animationTimeout = getTimeout(animationDelays, animationDurations);

    let type;
    let timeout = 0;
    let propCount = 0;
    /* istanbul ignore if */
    if (expectedType === TRANSITION) {
        if (transitionTimeout > 0) {
            type = TRANSITION;
            timeout = transitionTimeout;
            propCount = transitionDurations.length;
        }
    } else if (expectedType === ANIMATION) {
        if (animationTimeout > 0) {
            type = ANIMATION;
            timeout = animationTimeout;
            propCount = animationDurations.length;
        }
    } else {
        timeout = Math.max(transitionTimeout, animationTimeout);
        type = timeout > 0
            ? transitionTimeout > animationTimeout
                ? TRANSITION
                : ANIMATION
            : null;
        propCount = type
            ? type === TRANSITION
                ? transitionDurations.length
                : animationDurations.length
            : 0;
    }
    const hasTransform =
        type === TRANSITION &&
        transformRE.test(styles[transitionProp + 'Property']);
    return {
        type,
        timeout,
        propCount,
        hasTransform
    }
}

function getTimeout(delays, durations) {
    /* istanbul ignore next */
    while (delays.length < durations.length) {
        delays = delays.concat(delays);
    }

    return Math.max.apply(null, durations.map((d, i) = > {
        return toMs(d) + toMs(delays[i])
    })
)
}

function toMs(s) {
    return Number(s.slice(0, -1)) * 1000
}

/*  */

function enter(vnode, toggleDisplay) {
    const el = vnode.elm;

    // call leave callback now
    if (isDef(el._leaveCb)) {
        el._leaveCb.cancelled = true;
        el._leaveCb();
    }

    const data = resolveTransition(vnode.data.transition);
    if (isUndef(data)) {
        return
    }

    /* istanbul ignore if */
    if (isDef(el._enterCb) || el.nodeType !== 1) {
        return
    }

    const {
        css,
        type,
        enterClass,
        enterToClass,
        enterActiveClass,
        appearClass,
        appearToClass,
        appearActiveClass,
        beforeEnter,
        enter,
        afterEnter,
        enterCancelled,
        beforeAppear,
        appear,
        afterAppear,
        appearCancelled,
        duration
    } = data;

    // activeInstance will always be the <transition> component managing this
    // transition. One edge case to check is when the <transition> is placed
    // as the root node of a child component. In that case we need to check
    // <transition>'s parent for appear check.
    let context = activeInstance;
    let transitionNode = activeInstance.$vnode;
    while (transitionNode && transitionNode.parent) {
        transitionNode = transitionNode.parent;
        context = transitionNode.context;
    }

    const isAppear = !context._isMounted || !vnode.isRootInsert;

    if (isAppear && !appear && appear !== '') {
        return
    }

    const startClass = isAppear && appearClass
        ? appearClass
        : enterClass;
    const activeClass = isAppear && appearActiveClass
        ? appearActiveClass
        : enterActiveClass;
    const toClass = isAppear && appearToClass
        ? appearToClass
        : enterToClass;

    const beforeEnterHook = isAppear
        ? (beforeAppear || beforeEnter)
        : beforeEnter;
    const enterHook = isAppear
        ? (typeof appear === 'function' ? appear : enter)
        : enter;
    const afterEnterHook = isAppear
        ? (afterAppear || afterEnter)
        : afterEnter;
    const enterCancelledHook = isAppear
        ? (appearCancelled || enterCancelled)
        : enterCancelled;

    const explicitEnterDuration = toNumber(
        isObject(duration)
            ? duration.enter
            : duration
    );

    if ("development" !== 'production' && explicitEnterDuration != null) {
        checkDuration(explicitEnterDuration, 'enter', vnode);
    }

    const expectsCSS = css !== false && !isIE9;
    const userWantsControl = getHookArgumentsLength(enterHook);

    const cb = el._enterCb = once(() = > {
        if(expectsCSS) {
            removeTransitionClass(el, toClass);
            removeTransitionClass(el, activeClass);
        }
        if(cb.cancelled
)
    {
        if (expectsCSS) {
            removeTransitionClass(el, startClass);
        }
        enterCancelledHook && enterCancelledHook(el);
    }
else
    {
        afterEnterHook && afterEnterHook(el);
    }
    el._enterCb = null;
})
    ;

    if (!vnode.data.show) {
        // remove pending leave element on enter by injecting an insert hook
        mergeVNodeHook(vnode, 'insert', () = > {
            const parent = el.parentNode;
        const pendingNode = parent && parent._pending && parent._pending[vnode.key];
        if (pendingNode &&
            pendingNode.tag === vnode.tag &&
            pendingNode.elm._leaveCb
        ) {
            pendingNode.elm._leaveCb();
        }
        enterHook && enterHook(el, cb);
    })
        ;
    }

    // start enter transition
    beforeEnterHook && beforeEnterHook(el);
    if (expectsCSS) {
        addTransitionClass(el, startClass);
        addTransitionClass(el, activeClass);
        nextFrame(() = > {
            addTransitionClass(el, toClass);
        removeTransitionClass(el, startClass);
        if (!cb.cancelled && !userWantsControl) {
            if (isValidDuration(explicitEnterDuration)) {
                setTimeout(cb, explicitEnterDuration);
            } else {
                whenTransitionEnds(el, type, cb);
            }
        }
    })
        ;
    }

    if (vnode.data.show) {
        toggleDisplay && toggleDisplay();
        enterHook && enterHook(el, cb);
    }

    if (!expectsCSS && !userWantsControl) {
        cb();
    }
}

function leave(vnode, rm) {
    const el = vnode.elm;

    // call enter callback now
    if (isDef(el._enterCb)) {
        el._enterCb.cancelled = true;
        el._enterCb();
    }

    const data = resolveTransition(vnode.data.transition);
    if (isUndef(data) || el.nodeType !== 1) {
        return rm()
    }

    /* istanbul ignore if */
    if (isDef(el._leaveCb)) {
        return
    }

    const {
        css,
        type,
        leaveClass,
        leaveToClass,
        leaveActiveClass,
        beforeLeave,
        leave,
        afterLeave,
        leaveCancelled,
        delayLeave,
        duration
    } = data;

    const expectsCSS = css !== false && !isIE9;
    const userWantsControl = getHookArgumentsLength(leave);

    const explicitLeaveDuration = toNumber(
        isObject(duration)
            ? duration.leave
            : duration
    );

    if ("development" !== 'production' && isDef(explicitLeaveDuration)) {
        checkDuration(explicitLeaveDuration, 'leave', vnode);
    }

    const cb = el._leaveCb = once(() = > {
        if(el.parentNode && el.parentNode._pending
)
    {
        el.parentNode._pending[vnode.key] = null;
    }
    if (expectsCSS) {
        removeTransitionClass(el, leaveToClass);
        removeTransitionClass(el, leaveActiveClass);
    }
    if (cb.cancelled) {
        if (expectsCSS) {
            removeTransitionClass(el, leaveClass);
        }
        leaveCancelled && leaveCancelled(el);
    } else {
        rm();
        afterLeave && afterLeave(el);
    }
    el._leaveCb = null;
})
    ;

    if (delayLeave) {
        delayLeave(performLeave);
    } else {
        performLeave();
    }

    function performLeave() {
        // the delayed leave may have already been cancelled
        if (cb.cancelled) {
            return
        }
        // record leaving element
        if (!vnode.data.show) {
            (el.parentNode._pending || (el.parentNode._pending = {}))[(vnode.key)] = vnode;
        }
        beforeLeave && beforeLeave(el);
        if (expectsCSS) {
            addTransitionClass(el, leaveClass);
            addTransitionClass(el, leaveActiveClass);
            nextFrame(() = > {
                addTransitionClass(el, leaveToClass);
            removeTransitionClass(el, leaveClass);
            if (!cb.cancelled && !userWantsControl) {
                if (isValidDuration(explicitLeaveDuration)) {
                    setTimeout(cb, explicitLeaveDuration);
                } else {
                    whenTransitionEnds(el, type, cb);
                }
            }
        })
            ;
        }
        leave && leave(el, cb);
        if (!expectsCSS && !userWantsControl) {
            cb();
        }
    }
}

// only used in dev mode
function checkDuration(val, name, vnode) {
    if (typeof val !== 'number') {
        warn(
            `<transition> explicit ${name} duration is not a valid number - ` +
            `got ${JSON.stringify(val)}.`,
            vnode.context
        );
    } else if (isNaN(val)) {
        warn(
            `<transition> explicit ${name} duration is NaN - ` +
            'the duration expression might be incorrect.',
            vnode.context
        );
    }
}

function isValidDuration(val) {
    return typeof val === 'number' && !isNaN(val)
}

/**
 * Normalize a transition hook's argument length. The hook may be:
 * - a merged hook (invoker) with the original in .fns
 * - a wrapped component method (check ._length)
 * - a plain function (.length)
 */
function getHookArgumentsLength(fn) {
    if (isUndef(fn)) {
        return false
    }
    const invokerFns = fn.fns;
    if (isDef(invokerFns)) {
        // invoker
        return getHookArgumentsLength(
            Array.isArray(invokerFns)
                ? invokerFns[0]
                : invokerFns
        )
    } else {
        return (fn._length || fn.length) > 1
    }
}

function _enter(_, vnode) {
    if (vnode.data.show !== true) {
        enter(vnode);
    }
}

var transition = inBrowser ? {
    create: _enter,
    activate: _enter,
    remove(vnode, rm) {
        /* istanbul ignore else */
        if (vnode.data.show !== true) {
            leave(vnode, rm);
        } else {
            rm();
        }
    }
} : {};

var platformModules = [
    attrs,
    klass,
    events,
    domProps,
    style,
    transition
];

/*  */

// the directive module should be applied last, after all
// built-in modules have been applied.
const modules = platformModules.concat(baseModules);

const patch = createPatchFunction({nodeOps, modules});

/**
 * Not type checking this file because flow doesn't like attaching
 * properties to Elements.
 */

/* istanbul ignore if */
if (isIE9) {
    // http://www.matts411.com/post/internet-explorer-9-oninput/
    document.addEventListener('selectionchange', () = > {
        const el = document.activeElement;
    if (el && el.vmodel) {
        trigger(el, 'input');
    }
})
    ;
}

const directive = {
    inserted(el, binding, vnode, oldVnode) {
        if (vnode.tag === 'select') {
            // #6903
            if (oldVnode.elm && !oldVnode.elm._vOptions) {
                mergeVNodeHook(vnode, 'postpatch', () = > {
                    directive.componentUpdated(el, binding, vnode);
            })
                ;
            } else {
                setSelected(el, binding, vnode.context);
            }
            el._vOptions = [].map.call(el.options, getValue);
        } else if (vnode.tag === 'textarea' || isTextInputType(el.type)) {
            el._vModifiers = binding.modifiers;
            if (!binding.modifiers.lazy) {
                // Safari < 10.2 & UIWebView doesn't fire compositionend when
                // switching focus before confirming composition choice
                // this also fixes the issue where some browsers e.g. iOS Chrome
                // fires "change" instead of "input" on autocomplete.
                el.addEventListener('change', onCompositionEnd);
                if (!isAndroid) {
                    el.addEventListener('compositionstart', onCompositionStart);
                    el.addEventListener('compositionend', onCompositionEnd);
                }
                /* istanbul ignore if */
                if (isIE9) {
                    el.vmodel = true;
                }
            }
        }
    },

    componentUpdated(el, binding, vnode) {
        if (vnode.tag === 'select') {
            setSelected(el, binding, vnode.context);
            // in case the options rendered by v-for have changed,
            // it's possible that the value is out-of-sync with the rendered options.
            // detect such cases and filter out values that no longer has a matching
            // option in the DOM.
            const prevOptions = el._vOptions;
            const curOptions = el._vOptions = [].map.call(el.options, getValue);
            if (curOptions.some((o, i) = > !looseEqual(o, prevOptions[i])))
            {
                // trigger change event if
                // no matching option found for at least one value
                const needReset = el.multiple
                    ? binding.value.some(v = > hasNoMatchingOption(v, curOptions)
            )
            :
                binding.value !== binding.oldValue && hasNoMatchingOption(binding.value, curOptions);
                if (needReset) {
                    trigger(el, 'change');
                }
            }
        }
    }
};

function setSelected(el, binding, vm) {
    actuallySetSelected(el, binding, vm);
    /* istanbul ignore if */
    if (isIE || isEdge) {
        setTimeout(() = > {
            actuallySetSelected(el, binding, vm);
    },
        0
    )
        ;
    }
}

function actuallySetSelected(el, binding, vm) {
    const value = binding.value;
    const isMultiple = el.multiple;
    if (isMultiple && !Array.isArray(value)) {
        "development" !== 'production' && warn(
            `<select multiple v-model="${binding.expression}"> ` +
            `expects an Array value for its binding, but got ${
                Object.prototype.toString.call(value).slice(8, -1)
                }`,
            vm
        );
        return
    }
    let selected, option;
    for (let i = 0, l = el.options.length; i < l; i++) {
        option = el.options[i];
        if (isMultiple) {
            selected = looseIndexOf(value, getValue(option)) > -1;
            if (option.selected !== selected) {
                option.selected = selected;
            }
        } else {
            if (looseEqual(getValue(option), value)) {
                if (el.selectedIndex !== i) {
                    el.selectedIndex = i;
                }
                return
            }
        }
    }
    if (!isMultiple) {
        el.selectedIndex = -1;
    }
}

function hasNoMatchingOption(value, options) {
    return options.every(o = > !looseEqual(o, value)
)
}

function getValue(option) {
    return '_value' in option
        ? option._value
        : option.value
}

function onCompositionStart(e) {
    e.target.composing = true;
}

function onCompositionEnd(e) {
    // prevent triggering an input event for no reason
    if (!e.target.composing) return
    e.target.composing = false;
    trigger(e.target, 'input');
}

function trigger(el, type) {
    const e = document.createEvent('HTMLEvents');
    e.initEvent(type, true, true);
    el.dispatchEvent(e);
}

/*  */

// recursively search for possible transition defined inside the component root
function locateNode(vnode) {
    return vnode.componentInstance && (!vnode.data || !vnode.data.transition)
        ? locateNode(vnode.componentInstance._vnode)
        : vnode
}

var show = {
    bind(el, {value}, vnode) {
        vnode = locateNode(vnode);
        const transition$$1 = vnode.data && vnode.data.transition;
        const originalDisplay = el.__vOriginalDisplay =
            el.style.display === 'none' ? '' : el.style.display;
        if (value && transition$$1) {
            vnode.data.show = true;
            enter(vnode, () = > {
                el.style.display = originalDisplay;
        })
            ;
        } else {
            el.style.display = value ? originalDisplay : 'none';
        }
    },

    update(el, {value, oldValue}, vnode) {
        /* istanbul ignore if */
        if (value === oldValue) return
        vnode = locateNode(vnode);
        const transition$$1 = vnode.data && vnode.data.transition;
        if (transition$$1) {
            vnode.data.show = true;
            if (value) {
                enter(vnode, () = > {
                    el.style.display = el.__vOriginalDisplay;
            })
                ;
            } else {
                leave(vnode, () = > {
                    el.style.display = 'none';
            })
                ;
            }
        } else {
            el.style.display = value ? el.__vOriginalDisplay : 'none';
        }
    },

    unbind(
        el,
        binding,
        vnode,
        oldVnode,
        isDestroy
    ) {
        if (!isDestroy) {
            el.style.display = el.__vOriginalDisplay;
        }
    }
};

var platformDirectives = {
    model: directive,
    show
};

/*  */

// Provides transition support for a single element/component.
// supports transition mode (out-in / in-out)

const transitionProps = {
    name: String,
    appear: Boolean,
    css: Boolean,
    mode: String,
    type: String,
    enterClass: String,
    leaveClass: String,
    enterToClass: String,
    leaveToClass: String,
    enterActiveClass: String,
    leaveActiveClass: String,
    appearClass: String,
    appearActiveClass: String,
    appearToClass: String,
    duration: [Number, String, Object]
};

// in case the child is also an abstract component, e.g. <keep-alive>
// we want to recursively retrieve the real component to be rendered
function getRealChild(vnode) {
    const compOptions = vnode && vnode.componentOptions;
    if (compOptions && compOptions.Ctor.options.abstract) {
        return getRealChild(getFirstComponentChild(compOptions.children))
    } else {
        return vnode
    }
}

function extractTransitionData(comp) {
    const data = {};
    const options = comp.$options;
    // props
    for (const key in options.propsData) {
        data[key] = comp[key];
    }
    // events.
    // extract listeners and pass them directly to the transition methods
    const listeners = options._parentListeners;
    for (const key in listeners) {
        data[camelize(key)] = listeners[key];
    }
    return data
}

function placeholder(h, rawChild) {
    if (/\d-keep-alive$/.test(rawChild.tag)) {
        return h('keep-alive', {
            props: rawChild.componentOptions.propsData
        })
    }
}

function hasParentTransition(vnode) {
    while ((vnode = vnode.parent)) {
        if (vnode.data.transition) {
            return true
        }
    }
}

function isSameChild(child, oldChild) {
    return oldChild.key === child.key && oldChild.tag === child.tag
}

var Transition = {
    name: 'transition',
    props: transitionProps,
    abstract: true,

    render(h) {
        let children = this.$slots.default;
        if (!children) {
            return
        }

        // filter out text nodes (possible whitespaces)
        children = children.filter((c) = > c.tag || isAsyncPlaceholder(c)
    )
        ;
        /* istanbul ignore if */
        if (!children.length) {
            return
        }

        // warn multiple elements
        if ("development" !== 'production' && children.length > 1) {
            warn(
                '<transition> can only be used on a single element. Use ' +
                '<transition-group> for lists.',
                this.$parent
            );
        }

        const mode = this.mode;

        // warn invalid mode
        if ("development" !== 'production' &&
            mode && mode !== 'in-out' && mode !== 'out-in'
        ) {
            warn(
                'invalid <transition> mode: ' + mode,
                this.$parent
            );
        }

        const rawChild = children[0];

        // if this is a component root node and the component's
        // parent container node also has transition, skip.
        if (hasParentTransition(this.$vnode)) {
            return rawChild
        }

        // apply transition data to child
        // use getRealChild() to ignore abstract components e.g. keep-alive
        const child = getRealChild(rawChild);
        /* istanbul ignore if */
        if (!child) {
            return rawChild
        }

        if (this._leaving) {
            return placeholder(h, rawChild)
        }

        // ensure a key that is unique to the vnode type and to this transition
        // component instance. This key will be used to remove pending leaving nodes
        // during entering.
        const id = `__transition-${this._uid}-`;
        child.key = child.key == null
            ? child.isComment
                ? id + 'comment'
                : id + child.tag
            : isPrimitive(child.key)
                ? (String(child.key).indexOf(id) === 0 ? child.key : id + child.key)
                : child.key;

        const data = (child.data || (child.data = {})).transition = extractTransitionData(this);
        const oldRawChild = this._vnode;
        const oldChild = getRealChild(oldRawChild);

        // mark v-show
        // so that the transition module can hand over the control to the directive
        if (child.data.directives && child.data.directives.some(d = > d.name === 'show'))
        {
            child.data.show = true;
        }

        if (
            oldChild &&
            oldChild.data &&
            !isSameChild(child, oldChild) &&
            !isAsyncPlaceholder(oldChild) &&
            // #6687 component root is a comment node
            !(oldChild.componentInstance && oldChild.componentInstance._vnode.isComment)
        ) {
            // replace old child transition data with fresh one
            // important for dynamic transitions!
            const oldData = oldChild.data.transition = extend({}, data);
            // handle transition mode
            if (mode === 'out-in') {
                // return placeholder node and queue update when leave finishes
                this._leaving = true;
                mergeVNodeHook(oldData, 'afterLeave', () = > {
                    this._leaving = false;
                this.$forceUpdate();
            })
                ;
                return placeholder(h, rawChild)
            } else if (mode === 'in-out') {
                if (isAsyncPlaceholder(child)) {
                    return oldRawChild
                }
                let delayedLeave;
                const performLeave = () =
            >
                {
                    delayedLeave();
                }
                ;
                mergeVNodeHook(data, 'afterEnter', performLeave);
                mergeVNodeHook(data, 'enterCancelled', performLeave);
                mergeVNodeHook(oldData, 'delayLeave', leave = > {delayedLeave = leave;
            })
                ;
            }
        }

        return rawChild
    }
};

/*  */

// Provides transition support for list items.
// supports move transitions using the FLIP technique.

// Because the vdom's children update algorithm is "unstable" - i.e.
// it doesn't guarantee the relative positioning of removed elements,
// we force transition-group to update its children into two passes:
// in the first pass, we remove all nodes that need to be removed,
// triggering their leaving transition; in the second pass, we insert/move
// into the final desired state. This way in the second pass removed
// nodes will remain where they should be.

const props = extend({
    tag: String,
    moveClass: String
}, transitionProps);

delete props.mode;

var TransitionGroup = {
    props,

    render(h) {
        const tag = this.tag || this.$vnode.data.tag || 'span';
        const map = Object.create(null);
        const prevChildren = this.prevChildren = this.children;
        const rawChildren = this.$slots.default || [];
        const children = this.children = [];
        const transitionData = extractTransitionData(this);

        for (let i = 0; i < rawChildren.length; i++) {
            const c = rawChildren[i];
            if (c.tag) {
                if (c.key != null && String(c.key).indexOf('__vlist') !== 0) {
                    children.push(c);
                    map[c.key] = c
                    ;(c.data || (c.data = {})).transition = transitionData;
                } else {
                    const opts = c.componentOptions;
                    const name = opts ? (opts.Ctor.options.name || opts.tag || '') : c.tag;
                    warn(`<transition-group> children must be keyed: <${name}>`);
                }
            }
        }

        if (prevChildren) {
            const kept = [];
            const removed = [];
            for (let i = 0; i < prevChildren.length; i++) {
                const c = prevChildren[i];
                c.data.transition = transitionData;
                c.data.pos = c.elm.getBoundingClientRect();
                if (map[c.key]) {
                    kept.push(c);
                } else {
                    removed.push(c);
                }
            }
            this.kept = h(tag, null, kept);
            this.removed = removed;
        }

        return h(tag, null, children)
    },

    beforeUpdate() {
        // force removing pass
        this.__patch__(
            this._vnode,
            this.kept,
            false, // hydrating
            true // removeOnly (!important, avoids unnecessary moves)
        );
        this._vnode = this.kept;
    },

    updated() {
        const children = this.prevChildren;
        const moveClass = this.moveClass || ((this.name || 'v') + '-move');
        if (!children.length || !this.hasMove(children[0].elm, moveClass)) {
            return
        }

        // we divide the work into three loops to avoid mixing DOM reads and writes
        // in each iteration - which helps prevent layout thrashing.
        children.forEach(callPendingCbs);
        children.forEach(recordPosition);
        children.forEach(applyTranslation);

        // force reflow to put everything in position
        // assign to this to avoid being removed in tree-shaking
        // $flow-disable-line
        this._reflow = document.body.offsetHeight;

        children.forEach((c) = > {
            if(c.data.moved
    )
        {
            var el = c.elm;
            var s = el.style;
            addTransitionClass(el, moveClass);
            s.transform = s.WebkitTransform = s.transitionDuration = '';
            el.addEventListener(transitionEndEvent, el._moveCb = function cb(e) {
                if (!e || /transform$/.test(e.propertyName)) {
                    el.removeEventListener(transitionEndEvent, cb);
                    el._moveCb = null;
                    removeTransitionClass(el, moveClass);
                }
            });
        }
    })
        ;
    },

    methods: {
        hasMove(el, moveClass) {
            /* istanbul ignore if */
            if (!hasTransition) {
                return false
            }
            /* istanbul ignore if */
            if (this._hasMove) {
                return this._hasMove
            }
            // Detect whether an element with the move class applied has
            // CSS transitions. Since the element may be inside an entering
            // transition at this very moment, we make a clone of it and remove
            // all other transition classes applied to ensure only the move class
            // is applied.
            const clone = el.cloneNode();
            if (el._transitionClasses) {
                el._transitionClasses.forEach((cls) = > {removeClass(clone, cls);
            })
                ;
            }
            addClass(clone, moveClass);
            clone.style.display = 'none';
            this.$el.appendChild(clone);
            const info = getTransitionInfo(clone);
            this.$el.removeChild(clone);
            return (this._hasMove = info.hasTransform)
        }
    }
};

function callPendingCbs(c) {
    /* istanbul ignore if */
    if (c.elm._moveCb) {
        c.elm._moveCb();
    }
    /* istanbul ignore if */
    if (c.elm._enterCb) {
        c.elm._enterCb();
    }
}

function recordPosition(c) {
    c.data.newPos = c.elm.getBoundingClientRect();
}

function applyTranslation(c) {
    const oldPos = c.data.pos;
    const newPos = c.data.newPos;
    const dx = oldPos.left - newPos.left;
    const dy = oldPos.top - newPos.top;
    if (dx || dy) {
        c.data.moved = true;
        const s = c.elm.style;
        s.transform = s.WebkitTransform = `translate(${dx}px,${dy}px)`;
        s.transitionDuration = '0s';
    }
}

var platformComponents = {
    Transition,
    TransitionGroup
};

/*  */

// install platform specific utils
Vue$3.config.mustUseProp = mustUseProp;
Vue$3.config.isReservedTag = isReservedTag;
Vue$3.config.isReservedAttr = isReservedAttr;
Vue$3.config.getTagNamespace = getTagNamespace;
Vue$3.config.isUnknownElement = isUnknownElement;

// install platform runtime directives & components
extend(Vue$3.options.directives, platformDirectives);
extend(Vue$3.options.components, platformComponents);

// install platform patch function
Vue$3.prototype.__patch__ = inBrowser ? patch : noop;

// public mount method
Vue$3.prototype.$mount = function (
    el,
    hydrating
) {
    el = el && inBrowser ? query(el) : undefined;
    return mountComponent(this, el, hydrating)
};

// devtools global hook
/* istanbul ignore next */
Vue$3.nextTick(() = > {
    if(config.devtools
)
{
    if (devtools) {
        devtools.emit('init', Vue$3);
    } else if ("development" !== 'production' && isChrome) {
        console[console.info ? 'info' : 'log'](
            'Download the Vue Devtools extension for a better development experience:\n' +
            'https://github.com/vuejs/vue-devtools'
        );
    }
}
if ("development" !== 'production' &&
    config.productionTip !== false &&
    inBrowser && typeof console !== 'undefined'
) {
    console[console.info ? 'info' : 'log'](
        `You are running Vue in development mode.\n` +
        `Make sure to turn on production mode when deploying for production.\n` +
        `See more tips at https://vuejs.org/guide/deployment.html`
    );
}
},
0
)
;

/*  */

const defaultTagRE = /\{\{((?:.|\n)+?)\}\}/g;
const regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;

const buildRegex = cached(delimiters = > {
    const open = delimiters[0].replace(regexEscapeRE, '\\$&');
const close = delimiters[1].replace(regexEscapeRE, '\\$&');
return new RegExp(open + '((?:.|\\n)+?)' + close, 'g')
})
;

function parseText(
    text,
    delimiters
) {
    const tagRE = delimiters ? buildRegex(delimiters) : defaultTagRE;
    if (!tagRE.test(text)) {
        return
    }
    const tokens = [];
    let lastIndex = tagRE.lastIndex = 0;
    let match, index;
    while ((match = tagRE.exec(text))) {
        index = match.index;
        // push text token
        if (index > lastIndex) {
            tokens.push(JSON.stringify(text.slice(lastIndex, index)));
        }
        // tag token
        const exp = parseFilters(match[1].trim());
        tokens.push(`_s(${exp})`);
        lastIndex = index + match[0].length;
    }
    if (lastIndex < text.length) {
        tokens.push(JSON.stringify(text.slice(lastIndex)));
    }
    return tokens.join('+')
}

/*  */

function transformNode(el, options) {
    const warn = options.warn || baseWarn;
    const staticClass = getAndRemoveAttr(el, 'class');
    if ("development" !== 'production' && staticClass) {
        const expression = parseText(staticClass, options.delimiters);
        if (expression) {
            warn(
                `class="${staticClass}": ` +
                'Interpolation inside attributes has been removed. ' +
                'Use v-bind or the colon shorthand instead. For example, ' +
                'instead of <div class="{{ val }}">, use <div :class="val">.'
            );
        }
    }
    if (staticClass) {
        el.staticClass = JSON.stringify(staticClass);
    }
    const classBinding = getBindingAttr(el, 'class', false /* getStatic */);
    if (classBinding) {
        el.classBinding = classBinding;
    }
}

function genData(el) {
    let data = '';
    if (el.staticClass) {
        data += `staticClass:${el.staticClass},`;
    }
    if (el.classBinding) {
        data += `class:${el.classBinding},`;
    }
    return data
}

var klass$1 = {
    staticKeys: ['staticClass'],
    transformNode,
    genData
};

/*  */

function transformNode$1(el, options) {
    const warn = options.warn || baseWarn;
    const staticStyle = getAndRemoveAttr(el, 'style');
    if (staticStyle) {
        /* istanbul ignore if */
        {
            const expression = parseText(staticStyle, options.delimiters);
            if (expression) {
                warn(
                    `style="${staticStyle}": ` +
                    'Interpolation inside attributes has been removed. ' +
                    'Use v-bind or the colon shorthand instead. For example, ' +
                    'instead of <div style="{{ val }}">, use <div :style="val">.'
                );
            }
        }
        el.staticStyle = JSON.stringify(parseStyleText(staticStyle));
    }

    const styleBinding = getBindingAttr(el, 'style', false /* getStatic */);
    if (styleBinding) {
        el.styleBinding = styleBinding;
    }
}

function genData$1(el) {
    let data = '';
    if (el.staticStyle) {
        data += `staticStyle:${el.staticStyle},`;
    }
    if (el.styleBinding) {
        data += `style:(${el.styleBinding}),`;
    }
    return data
}

var style$1 = {
    staticKeys: ['staticStyle'],
    transformNode: transformNode$1,
    genData: genData$1
};

/*  */

let decoder;

var he = {
    decode(html) {
        decoder = decoder || document.createElement('div');
        decoder.innerHTML = html;
        return decoder.textContent
    }
};

/*  */

const isUnaryTag = makeMap(
    'area,base,br,col,embed,frame,hr,img,input,isindex,keygen,' +
    'link,meta,param,source,track,wbr'
);

// Elements that you can, intentionally, leave open
// (and which close themselves)
const canBeLeftOpenTag = makeMap(
    'colgroup,dd,dt,li,options,p,td,tfoot,th,thead,tr,source'
);

// HTML5 tags https://html.spec.whatwg.org/multipage/indices.html#elements-3
// Phrasing Content https://html.spec.whatwg.org/multipage/dom.html#phrasing-content
const isNonPhrasingTag = makeMap(
    'address,article,aside,base,blockquote,body,caption,col,colgroup,dd,' +
    'details,dialog,div,dl,dt,fieldset,figcaption,figure,footer,form,' +
    'h1,h2,h3,h4,h5,h6,head,header,hgroup,hr,html,legend,li,menuitem,meta,' +
    'optgroup,option,param,rp,rt,source,style,summary,tbody,td,tfoot,th,thead,' +
    'title,tr,track'
);

/**
 * Not type-checking this file because it's mostly vendor code.
 */

/*!
 * HTML Parser By John Resig (ejohn.org)
 * Modified by Juriy "kangax" Zaytsev
 * Original code by Erik Arvidsson, Mozilla Public License
 * http://erik.eae.net/simplehtmlparser/simplehtmlparser.js
 */

// Regular Expressions for parsing tags and attributes
const attribute = /^\s*([^\s"'<>\/=]+)(?:\s*(=)\s*(?:"([^"]*)"+|'([^']*)'+|([^\s"'=<>`]+)))?/;
// could use https://www.w3.org/TR/1999/REC-xml-names-19990114/#NT-QName
// but for Vue templates we can enforce a simple charset
const ncname = '[a-zA-Z_][\\w\\-\\.]*';
const qnameCapture = `((?:${ncname}\\:)?${ncname})`;
const startTagOpen = new RegExp(`^<${qnameCapture}`);
const startTagClose = /^\s*(\/?)>/;
const endTag = new RegExp(`^<\\/${qnameCapture}[^>]*>`);
const doctype = /^<!DOCTYPE [^>]+>/i;
const comment = /^<!--/;
const conditionalComment = /^<!\[/;

let IS_REGEX_CAPTURING_BROKEN = false;
'x'.replace(/x(.)?/g, function (m, g) {
    IS_REGEX_CAPTURING_BROKEN = g === '';
});

// Special Elements (can contain anything)
const isPlainTextElement = makeMap('script,style,textarea', true);
const reCache = {};

const decodingMap = {
    '&lt;': '<',
    '&gt;': '>',
    '&quot;': '"',
    '&amp;': '&',
    '&#10;': '\n',
    '&#9;': '\t'
};
const encodedAttr = /&(?:lt|gt|quot|amp);/g;
const encodedAttrWithNewLines = /&(?:lt|gt|quot|amp|#10|#9);/g;

// #5992
const isIgnoreNewlineTag = makeMap('pre,textarea', true);
const shouldIgnoreFirstNewline = (tag, html) =
>
tag && isIgnoreNewlineTag(tag) && html[0] === '\n';

function decodeAttr(value, shouldDecodeNewlines) {
    const re = shouldDecodeNewlines ? encodedAttrWithNewLines : encodedAttr;
    return value.replace(re, match = > decodingMap[match]
)
}

function parseHTML(html, options) {
    const stack = [];
    const expectHTML = options.expectHTML;
    const isUnaryTag$$1 = options.isUnaryTag || no;
    const canBeLeftOpenTag$$1 = options.canBeLeftOpenTag || no;
    let index = 0;
    let last, lastTag;
    while (html) {
        last = html;
        // Make sure we're not in a plaintext content element like script/style
        if (!lastTag || !isPlainTextElement(lastTag)) {
            let textEnd = html.indexOf('<');
            if (textEnd === 0) {
                // Comment:
                if (comment.test(html)) {
                    const commentEnd = html.indexOf('-->');

                    if (commentEnd >= 0) {
                        if (options.shouldKeepComment) {
                            options.comment(html.substring(4, commentEnd));
                        }
                        advance(commentEnd + 3);
                        continue
                    }
                }

                // http://en.wikipedia.org/wiki/Conditional_comment#Downlevel-revealed_conditional_comment
                if (conditionalComment.test(html)) {
                    const conditionalEnd = html.indexOf(']>');

                    if (conditionalEnd >= 0) {
                        advance(conditionalEnd + 2);
                        continue
                    }
                }

                // Doctype:
                const doctypeMatch = html.match(doctype);
                if (doctypeMatch) {
                    advance(doctypeMatch[0].length);
                    continue
                }

                // End tag:
                const endTagMatch = html.match(endTag);
                if (endTagMatch) {
                    const curIndex = index;
                    advance(endTagMatch[0].length);
                    parseEndTag(endTagMatch[1], curIndex, index);
                    continue
                }

                // Start tag:
                const startTagMatch = parseStartTag();
                if (startTagMatch) {
                    handleStartTag(startTagMatch);
                    if (shouldIgnoreFirstNewline(lastTag, html)) {
                        advance(1);
                    }
                    continue
                }
            }

            let text, rest, next;
            if (textEnd >= 0) {
                rest = html.slice(textEnd);
                while (
                    !endTag.test(rest) &&
                    !startTagOpen.test(rest) &&
                    !comment.test(rest) &&
                    !conditionalComment.test(rest)
                    ) {
                    // < in plain text, be forgiving and treat it as text
                    next = rest.indexOf('<', 1);
                    if (next < 0) break
                    textEnd += next;
                    rest = html.slice(textEnd);
                }
                text = html.substring(0, textEnd);
                advance(textEnd);
            }

            if (textEnd < 0) {
                text = html;
                html = '';
            }

            if (options.chars && text) {
                options.chars(text);
            }
        } else {
            let endTagLength = 0;
            const stackedTag = lastTag.toLowerCase();
            const reStackedTag = reCache[stackedTag] || (reCache[stackedTag] = new RegExp('([\\s\\S]*?)(</' + stackedTag + '[^>]*>)', 'i'));
            const rest = html.replace(reStackedTag, function (all, text, endTag) {
                endTagLength = endTag.length;
                if (!isPlainTextElement(stackedTag) && stackedTag !== 'noscript') {
                    text = text
                        .replace(/<!--([\s\S]*?)-->/g, '$1')
                        .replace(/<!\[CDATA\[([\s\S]*?)]]>/g, '$1');
                }
                if (shouldIgnoreFirstNewline(stackedTag, text)) {
                    text = text.slice(1);
                }
                if (options.chars) {
                    options.chars(text);
                }
                return ''
            });
            index += html.length - rest.length;
            html = rest;
            parseEndTag(stackedTag, index - endTagLength, index);
        }

        if (html === last) {
            options.chars && options.chars(html);
            if ("development" !== 'production' && !stack.length && options.warn) {
                options.warn(`Mal-formatted tag at end of template: "${html}"`);
            }
            break
        }
    }

    // Clean up any remaining tags
    parseEndTag();

    function advance(n) {
        index += n;
        html = html.substring(n);
    }

    function parseStartTag() {
        const start = html.match(startTagOpen);
        if (start) {
            const match = {
                tagName: start[1],
                attrs: [],
                start: index
            };
            advance(start[0].length);
            let end, attr;
            while (!(end = html.match(startTagClose)) && (attr = html.match(attribute))) {
                advance(attr[0].length);
                match.attrs.push(attr);
            }
            if (end) {
                match.unarySlash = end[1];
                advance(end[0].length);
                match.end = index;
                return match
            }
        }
    }

    function handleStartTag(match) {
        const tagName = match.tagName;
        const unarySlash = match.unarySlash;

        if (expectHTML) {
            if (lastTag === 'p' && isNonPhrasingTag(tagName)) {
                parseEndTag(lastTag);
            }
            if (canBeLeftOpenTag$$1(tagName) && lastTag === tagName) {
                parseEndTag(tagName);
            }
        }

        const unary = isUnaryTag$$1(tagName) || !!unarySlash;

        const l = match.attrs.length;
        const attrs = new Array(l);
        for (let i = 0; i < l; i++) {
            const args = match.attrs[i];
            // hackish work around FF bug https://bugzilla.mozilla.org/show_bug.cgi?id=369778
            if (IS_REGEX_CAPTURING_BROKEN && args[0].indexOf('""') === -1) {
                if (args[3] === '') {
                    delete args[3];
                }
                if (args[4] === '') {
                    delete args[4];
                }
                if (args[5] === '') {
                    delete args[5];
                }
            }
            const value = args[3] || args[4] || args[5] || '';
            const shouldDecodeNewlines = tagName === 'a' && args[1] === 'href'
                ? options.shouldDecodeNewlinesForHref
                : options.shouldDecodeNewlines;
            attrs[i] = {
                name: args[1],
                value: decodeAttr(value, shouldDecodeNewlines)
            };
        }

        if (!unary) {
            stack.push({tag: tagName, lowerCasedTag: tagName.toLowerCase(), attrs: attrs});
            lastTag = tagName;
        }

        if (options.start) {
            options.start(tagName, attrs, unary, match.start, match.end);
        }
    }

    function parseEndTag(tagName, start, end) {
        let pos, lowerCasedTagName;
        if (start == null) start = index;
        if (end == null) end = index;

        if (tagName) {
            lowerCasedTagName = tagName.toLowerCase();
        }

        // Find the closest opened tag of the same type
        if (tagName) {
            for (pos = stack.length - 1; pos >= 0; pos--) {
                if (stack[pos].lowerCasedTag === lowerCasedTagName) {
                    break
                }
            }
        } else {
            // If no tag name is provided, clean shop
            pos = 0;
        }

        if (pos >= 0) {
            // Close all the open elements, up the stack
            for (let i = stack.length - 1; i >= pos; i--) {
                if ("development" !== 'production' &&
                    (i > pos || !tagName) &&
                    options.warn
                ) {
                    options.warn(
                        `tag <${stack[i].tag}> has no matching end tag.`
                    );
                }
                if (options.end) {
                    options.end(stack[i].tag, start, end);
                }
            }

            // Remove the open elements from the stack
            stack.length = pos;
            lastTag = pos && stack[pos - 1].tag;
        } else if (lowerCasedTagName === 'br') {
            if (options.start) {
                options.start(tagName, [], true, start, end);
            }
        } else if (lowerCasedTagName === 'p') {
            if (options.start) {
                options.start(tagName, [], false, start, end);
            }
            if (options.end) {
                options.end(tagName, start, end);
            }
        }
    }
}

/*  */

const onRE = /^@|^v-on:/;
const dirRE = /^v-|^@|^:/;
const forAliasRE = /(.*?)\s+(?:in|of)\s+(.*)/;
const forIteratorRE = /\((\{[^}]*\}|[^,]*),([^,]*)(?:,([^,]*))?\)/;

const argRE = /:(.*)$/;
const bindRE = /^:|^v-bind:/;
const modifierRE = /\.[^.]+/g;

const decodeHTMLCached = cached(he.decode);

// configurable state
let warn$2;
let delimiters;
let transforms;
let preTransforms;
let postTransforms;
let platformIsPreTag;
let platformMustUseProp;
let platformGetTagNamespace;


function createASTElement(
    tag,
    attrs,
    parent
) {
    return {
        type: 1,
        tag,
        attrsList: attrs,
        attrsMap: makeAttrsMap(attrs),
        parent,
        children: []
    }
}

/**
 * Convert HTML string to AST.
 */
function parse(
    template,
    options
) {
    warn$2 = options.warn || baseWarn;

    platformIsPreTag = options.isPreTag || no;
    platformMustUseProp = options.mustUseProp || no;
    platformGetTagNamespace = options.getTagNamespace || no;

    transforms = pluckModuleFunction(options.modules, 'transformNode');
    preTransforms = pluckModuleFunction(options.modules, 'preTransformNode');
    postTransforms = pluckModuleFunction(options.modules, 'postTransformNode');

    delimiters = options.delimiters;

    const stack = [];
    const preserveWhitespace = options.preserveWhitespace !== false;
    let root;
    let currentParent;
    let inVPre = false;
    let inPre = false;
    let warned = false;

    function warnOnce(msg) {
        if (!warned) {
            warned = true;
            warn$2(msg);
        }
    }

    function endPre(element) {
        // check pre state
        if (element.pre) {
            inVPre = false;
        }
        if (platformIsPreTag(element.tag)) {
            inPre = false;
        }
    }

    parseHTML(template, {
        warn: warn$2,
        expectHTML: options.expectHTML,
        isUnaryTag: options.isUnaryTag,
        canBeLeftOpenTag: options.canBeLeftOpenTag,
        shouldDecodeNewlines: options.shouldDecodeNewlines,
        shouldDecodeNewlinesForHref: options.shouldDecodeNewlinesForHref,
        shouldKeepComment: options.comments,
        start(tag, attrs, unary) {
            // check namespace.
            // inherit parent ns if there is one
            const ns = (currentParent && currentParent.ns) || platformGetTagNamespace(tag);

            // handle IE svg bug
            /* istanbul ignore if */
            if (isIE && ns === 'svg') {
                attrs = guardIESVGBug(attrs);
            }

            let element = createASTElement(tag, attrs, currentParent);
            if (ns) {
                element.ns = ns;
            }

            if (isForbiddenTag(element) && !isServerRendering()) {
                element.forbidden = true;
                "development" !== 'production' && warn$2(
                    'Templates should only be responsible for mapping the state to the ' +
                    'UI. Avoid placing tags with side-effects in your templates, such as ' +
                    `<${tag}>` + ', as they will not be parsed.'
                );
            }

            // apply pre-transforms
            for (let i = 0; i < preTransforms.length; i++) {
                element = preTransforms[i](element, options) || element;
            }

            if (!inVPre) {
                processPre(element);
                if (element.pre) {
                    inVPre = true;
                }
            }
            if (platformIsPreTag(element.tag)) {
                inPre = true;
            }
            if (inVPre) {
                processRawAttrs(element);
            } else if (!element.processed) {
                // structural directives
                processFor(element);
                processIf(element);
                processOnce(element);
                // element-scope stuff
                processElement(element, options);
            }

            function checkRootConstraints(el) {
                {
                    if (el.tag === 'slot' || el.tag === 'template') {
                        warnOnce(
                            `Cannot use <${el.tag}> as component root element because it may ` +
                            'contain multiple nodes.'
                        );
                    }
                    if (el.attrsMap.hasOwnProperty('v-for')) {
                        warnOnce(
                            'Cannot use v-for on stateful component root element because ' +
                            'it renders multiple elements.'
                        );
                    }
                }
            }

            // tree management
            if (!root) {
                root = element;
                checkRootConstraints(root);
            } else if (!stack.length) {
                // allow root elements with v-if, v-else-if and v-else
                if (root.if && (element.elseif || element.else)) {
                    checkRootConstraints(element);
                    addIfCondition(root, {
                        exp: element.elseif,
                        block: element
                    });
                } else {
                    warnOnce(
                        `Component template should contain exactly one root element. ` +
                        `If you are using v-if on multiple elements, ` +
                        `use v-else-if to chain them instead.`
                    );
                }
            }
            if (currentParent && !element.forbidden) {
                if (element.elseif || element.else) {
                    processIfConditions(element, currentParent);
                } else if (element.slotScope) { // scoped slot
                    currentParent.plain = false;
                    const name = element.slotTarget || '"default"';
                    (currentParent.scopedSlots || (currentParent.scopedSlots = {}))[name] = element;
                } else {
                    currentParent.children.push(element);
                    element.parent = currentParent;
                }
            }
            if (!unary) {
                currentParent = element;
                stack.push(element);
            } else {
                endPre(element);
            }
            // apply post-transforms
            for (let i = 0; i < postTransforms.length; i++) {
                postTransforms[i](element, options);
            }
        },

        end() {
            // remove trailing whitespace
            const element = stack[stack.length - 1];
            const lastNode = element.children[element.children.length - 1];
            if (lastNode && lastNode.type === 3 && lastNode.text === ' ' && !inPre) {
                element.children.pop();
            }
            // pop stack
            stack.length -= 1;
            currentParent = stack[stack.length - 1];
            endPre(element);
        },

        chars(text) {
            if (!currentParent) {
                {
                    if (text === template) {
                        warnOnce(
                            'Component template requires a root element, rather than just text.'
                        );
                    } else if ((text = text.trim())) {
                        warnOnce(
                            `text "${text}" outside root element will be ignored.`
                        );
                    }
                }
                return
            }
            // IE textarea placeholder bug
            /* istanbul ignore if */
            if (isIE &&
                currentParent.tag === 'textarea' &&
                currentParent.attrsMap.placeholder === text
            ) {
                return
            }
            const children = currentParent.children;
            text = inPre || text.trim()
                ? isTextTag(currentParent) ? text : decodeHTMLCached(text)
                // only preserve whitespace if its not right after a starting tag
                : preserveWhitespace && children.length ? ' ' : '';
            if (text) {
                let expression;
                if (!inVPre && text !== ' ' && (expression = parseText(text, delimiters))) {
                    children.push({
                        type: 2,
                        expression,
                        text
                    });
                } else if (text !== ' ' || !children.length || children[children.length - 1].text !== ' ') {
                    children.push({
                        type: 3,
                        text
                    });
                }
            }
        },
        comment(text) {
            currentParent.children.push({
                type: 3,
                text,
                isComment: true
            });
        }
    });
    return root
}

function processPre(el) {
    if (getAndRemoveAttr(el, 'v-pre') != null) {
        el.pre = true;
    }
}

function processRawAttrs(el) {
    const l = el.attrsList.length;
    if (l) {
        const attrs = el.attrs = new Array(l);
        for (let i = 0; i < l; i++) {
            attrs[i] = {
                name: el.attrsList[i].name,
                value: JSON.stringify(el.attrsList[i].value)
            };
        }
    } else if (!el.pre) {
        // non root node in pre blocks with no attributes
        el.plain = true;
    }
}

function processElement(element, options) {
    processKey(element);

    // determine whether this is a plain element after
    // removing structural attributes
    element.plain = !element.key && !element.attrsList.length;

    processRef(element);
    processSlot(element);
    processComponent(element);
    for (let i = 0; i < transforms.length; i++) {
        element = transforms[i](element, options) || element;
    }
    processAttrs(element);
}

function processKey(el) {
    const exp = getBindingAttr(el, 'key');
    if (exp) {
        if ("development" !== 'production' && el.tag === 'template') {
            warn$2(`<template> cannot be keyed. Place the key on real elements instead.`);
        }
        el.key = exp;
    }
}

function processRef(el) {
    const ref = getBindingAttr(el, 'ref');
    if (ref) {
        el.ref = ref;
        el.refInFor = checkInFor(el);
    }
}

function processFor(el) {
    let exp;
    if ((exp = getAndRemoveAttr(el, 'v-for'))) {
        const inMatch = exp.match(forAliasRE);
        if (!inMatch) {
            "development" !== 'production' && warn$2(
                `Invalid v-for expression: ${exp}`
            );
            return
        }
        el.for = inMatch[2].trim();
        const alias = inMatch[1].trim();
        const iteratorMatch = alias.match(forIteratorRE);
        if (iteratorMatch) {
            el.alias = iteratorMatch[1].trim();
            el.iterator1 = iteratorMatch[2].trim();
            if (iteratorMatch[3]) {
                el.iterator2 = iteratorMatch[3].trim();
            }
        } else {
            el.alias = alias;
        }
    }
}

function processIf(el) {
    const exp = getAndRemoveAttr(el, 'v-if');
    if (exp) {
        el.if = exp;
        addIfCondition(el, {
            exp: exp,
            block: el
        });
    } else {
        if (getAndRemoveAttr(el, 'v-else') != null) {
            el.else = true;
        }
        const elseif = getAndRemoveAttr(el, 'v-else-if');
        if (elseif) {
            el.elseif = elseif;
        }
    }
}

function processIfConditions(el, parent) {
    const prev = findPrevElement(parent.children);
    if (prev && prev.if) {
        addIfCondition(prev, {
            exp: el.elseif,
            block: el
        });
    } else {
        warn$2(
            `v-${el.elseif ? ('else-if="' + el.elseif + '"') : 'else'} ` +
            `used on element <${el.tag}> without corresponding v-if.`
        );
    }
}

function findPrevElement(children) {
    let i = children.length;
    while (i--) {
        if (children[i].type === 1) {
            return children[i]
        } else {
            if ("development" !== 'production' && children[i].text !== ' ') {
                warn$2(
                    `text "${children[i].text.trim()}" between v-if and v-else(-if) ` +
                    `will be ignored.`
                );
            }
            children.pop();
        }
    }
}

function addIfCondition(el, condition) {
    if (!el.ifConditions) {
        el.ifConditions = [];
    }
    el.ifConditions.push(condition);
}

function processOnce(el) {
    const once$$1 = getAndRemoveAttr(el, 'v-once');
    if (once$$1 != null) {
        el.once = true;
    }
}

function processSlot(el) {
    if (el.tag === 'slot') {
        el.slotName = getBindingAttr(el, 'name');
        if ("development" !== 'production' && el.key) {
            warn$2(
                `\`key\` does not work on <slot> because slots are abstract outlets ` +
                `and can possibly expand into multiple elements. ` +
                `Use the key on a wrapping element instead.`
            );
        }
    } else {
        let slotScope;
        if (el.tag === 'template') {
            slotScope = getAndRemoveAttr(el, 'scope');
            /* istanbul ignore if */
            if ("development" !== 'production' && slotScope) {
                warn$2(
                    `the "scope" attribute for scoped slots have been deprecated and ` +
                    `replaced by "slot-scope" since 2.5. The new "slot-scope" attribute ` +
                    `can also be used on plain elements in addition to <template> to ` +
                    `denote scoped slots.`,
                    true
                );
            }
            el.slotScope = slotScope || getAndRemoveAttr(el, 'slot-scope');
        } else if ((slotScope = getAndRemoveAttr(el, 'slot-scope'))) {
            /* istanbul ignore if */
            if ("development" !== 'production' && el.attrsMap['v-for']) {
                warn$2(
                    `Ambiguous combined usage of slot-scope and v-for on <${el.tag}> ` +
                    `(v-for takes higher priority). Use a wrapper <template> for the ` +
                    `scoped slot to make it clearer.`,
                    true
                );
            }
            el.slotScope = slotScope;
        }
        const slotTarget = getBindingAttr(el, 'slot');
        if (slotTarget) {
            el.slotTarget = slotTarget === '""' ? '"default"' : slotTarget;
            // preserve slot as an attribute for native shadow DOM compat
            // only for non-scoped slots.
            if (el.tag !== 'template' && !el.slotScope) {
                addAttr(el, 'slot', slotTarget);
            }
        }
    }
}

function processComponent(el) {
    let binding;
    if ((binding = getBindingAttr(el, 'is'))) {
        el.component = binding;
    }
    if (getAndRemoveAttr(el, 'inline-template') != null) {
        el.inlineTemplate = true;
    }
}

function processAttrs(el) {
    const list = el.attrsList;
    let i, l, name, rawName, value, modifiers, isProp;
    for (i = 0, l = list.length; i < l; i++) {
        name = rawName = list[i].name;
        value = list[i].value;
        if (dirRE.test(name)) {
            // mark element as dynamic
            el.hasBindings = true;
            // modifiers
            modifiers = parseModifiers(name);
            if (modifiers) {
                name = name.replace(modifierRE, '');
            }
            if (bindRE.test(name)) { // v-bind
                name = name.replace(bindRE, '');
                value = parseFilters(value);
                isProp = false;
                if (modifiers) {
                    if (modifiers.prop) {
                        isProp = true;
                        name = camelize(name);
                        if (name === 'innerHtml') name = 'innerHTML';
                    }
                    if (modifiers.camel) {
                        name = camelize(name);
                    }
                    if (modifiers.sync) {
                        addHandler(
                            el,
                            `update:${camelize(name)}`,
                            genAssignmentCode(value, `$event`)
                        );
                    }
                }
                if (isProp || (
                    !el.component && platformMustUseProp(el.tag, el.attrsMap.type, name)
                )) {
                    addProp(el, name, value);
                } else {
                    addAttr(el, name, value);
                }
            } else if (onRE.test(name)) { // v-on
                name = name.replace(onRE, '');
                addHandler(el, name, value, modifiers, false, warn$2);
            } else { // normal directives
                name = name.replace(dirRE, '');
                // parse arg
                const argMatch = name.match(argRE);
                const arg = argMatch && argMatch[1];
                if (arg) {
                    name = name.slice(0, -(arg.length + 1));
                }
                addDirective(el, name, rawName, value, arg, modifiers);
                if ("development" !== 'production' && name === 'model') {
                    checkForAliasModel(el, value);
                }
            }
        } else {
            // literal attribute
            {
                const expression = parseText(value, delimiters);
                if (expression) {
                    warn$2(
                        `${name}="${value}": ` +
                        'Interpolation inside attributes has been removed. ' +
                        'Use v-bind or the colon shorthand instead. For example, ' +
                        'instead of <div id="{{ val }}">, use <div :id="val">.'
                    );
                }
            }
            addAttr(el, name, JSON.stringify(value));
            // #6887 firefox doesn't update muted state if set via attribute
            // even immediately after element creation
            if (!el.component &&
                name === 'muted' &&
                platformMustUseProp(el.tag, el.attrsMap.type, name)) {
                addProp(el, name, 'true');
            }
        }
    }
}

function checkInFor(el) {
    let parent = el;
    while (parent) {
        if (parent.for !== undefined) {
            return true
        }
        parent = parent.parent;
    }
    return false
}

function parseModifiers(name) {
    const match = name.match(modifierRE);
    if (match) {
        const ret = {};
        match.forEach(m = > {ret[m.slice(1)] = true;
    })
        ;
        return ret
    }
}

function makeAttrsMap(attrs) {
    const map = {};
    for (let i = 0, l = attrs.length; i < l; i++) {
        if (
            "development" !== 'production' &&
            map[attrs[i].name] && !isIE && !isEdge
        ) {
            warn$2('duplicate attribute: ' + attrs[i].name);
        }
        map[attrs[i].name] = attrs[i].value;
    }
    return map
}

// for script (e.g. type="x/template") or style, do not decode content
function isTextTag(el) {
    return el.tag === 'script' || el.tag === 'style'
}

function isForbiddenTag(el) {
    return (
        el.tag === 'style' ||
        (el.tag === 'script' && (
            !el.attrsMap.type ||
            el.attrsMap.type === 'text/javascript'
        ))
    )
}

const ieNSBug = /^xmlns:NS\d+/;
const ieNSPrefix = /^NS\d+:/;

/* istanbul ignore next */
function guardIESVGBug(attrs) {
    const res = [];
    for (let i = 0; i < attrs.length; i++) {
        const attr = attrs[i];
        if (!ieNSBug.test(attr.name)) {
            attr.name = attr.name.replace(ieNSPrefix, '');
            res.push(attr);
        }
    }
    return res
}

function checkForAliasModel(el, value) {
    let _el = el;
    while (_el) {
        if (_el.for && _el.alias === value) {
            warn$2(
                `<${el.tag} v-model="${value}">: ` +
                `You are binding v-model directly to a v-for iteration alias. ` +
                `This will not be able to modify the v-for source array because ` +
                `writing to the alias is like modifying a function local variable. ` +
                `Consider using an array of objects and use v-model on an object property instead.`
            );
        }
        _el = _el.parent;
    }
}

/*  */

/**
 * Expand input[v-model] with dyanmic type bindings into v-if-else chains
 * Turn this:
 *   <input v-model="data[type]" :type="type">
 * into this:
 *   <input v-if="type === 'checkbox'" type="checkbox" v-model="data[type]">
 *   <input v-else-if="type === 'radio'" type="radio" v-model="data[type]">
 *   <input v-else :type="type" v-model="data[type]">
 */

function preTransformNode(el, options) {
    if (el.tag === 'input') {
        const map = el.attrsMap;
        if (map['v-model'] && (map['v-bind:type'] || map[':type'])) {
            const typeBinding = getBindingAttr(el, 'type');
            const ifCondition = getAndRemoveAttr(el, 'v-if', true);
            const ifConditionExtra = ifCondition ? `&&(${ifCondition})` : ``;
            const hasElse = getAndRemoveAttr(el, 'v-else', true) != null;
            const elseIfCondition = getAndRemoveAttr(el, 'v-else-if', true);
            // 1. checkbox
            const branch0 = cloneASTElement(el);
            // process for on the main node
            processFor(branch0);
            addRawAttr(branch0, 'type', 'checkbox');
            processElement(branch0, options);
            branch0.processed = true; // prevent it from double-processed
            branch0.if = `(${typeBinding})==='checkbox'` + ifConditionExtra;
            addIfCondition(branch0, {
                exp: branch0.if,
                block: branch0
            });
            // 2. add radio else-if condition
            const branch1 = cloneASTElement(el);
            getAndRemoveAttr(branch1, 'v-for', true);
            addRawAttr(branch1, 'type', 'radio');
            processElement(branch1, options);
            addIfCondition(branch0, {
                exp: `(${typeBinding})==='radio'` + ifConditionExtra,
                block: branch1
            });
            // 3. other
            const branch2 = cloneASTElement(el);
            getAndRemoveAttr(branch2, 'v-for', true);
            addRawAttr(branch2, ':type', typeBinding);
            processElement(branch2, options);
            addIfCondition(branch0, {
                exp: ifCondition,
                block: branch2
            });

            if (hasElse) {
                branch0.else = true;
            } else if (elseIfCondition) {
                branch0.elseif = elseIfCondition;
            }

            return branch0
        }
    }
}

function cloneASTElement(el) {
    return createASTElement(el.tag, el.attrsList.slice(), el.parent)
}

function addRawAttr(el, name, value) {
    el.attrsMap[name] = value;
    el.attrsList.push({name, value});
}

var model$2 = {
    preTransformNode
};

var modules$1 = [
    klass$1,
    style$1,
    model$2
];

/*  */

function text(el, dir) {
    if (dir.value) {
        addProp(el, 'textContent', `_s(${dir.value})`);
    }
}

/*  */

function html(el, dir) {
    if (dir.value) {
        addProp(el, 'innerHTML', `_s(${dir.value})`);
    }
}

var directives$1 = {
    model,
    text,
    html
};

/*  */

const baseOptions = {
    expectHTML: true,
    modules: modules$1,
    directives: directives$1,
    isPreTag,
    isUnaryTag,
    mustUseProp,
    canBeLeftOpenTag,
    isReservedTag,
    getTagNamespace,
    staticKeys: genStaticKeys(modules$1)
};

/*  */

let isStaticKey;
let isPlatformReservedTag;

const genStaticKeysCached = cached(genStaticKeys$1);

/**
 * Goal of the optimizer: walk the generated template AST tree
 * and detect sub-trees that are purely static, i.e. parts of
 * the DOM that never needs to change.
 *
 * Once we detect these sub-trees, we can:
 *
 * 1. Hoist them into constants, so that we no longer need to
 *    create fresh nodes for them on each re-render;
 * 2. Completely skip them in the patching process.
 */
function optimize(root, options) {
    if (!root) return
    isStaticKey = genStaticKeysCached(options.staticKeys || '');
    isPlatformReservedTag = options.isReservedTag || no;
    // first pass: mark all non-static nodes.
    markStatic$1(root);
    // second pass: mark static roots.
    markStaticRoots(root, false);
}

function genStaticKeys$1(keys) {
    return makeMap(
        'type,tag,attrsList,attrsMap,plain,parent,children,attrs' +
        (keys ? ',' + keys : '')
    )
}

function markStatic$1(node) {
    node.static = isStatic(node);
    if (node.type === 1) {
        // do not make component slot content static. this avoids
        // 1. components not able to mutate slot nodes
        // 2. static slot content fails for hot-reloading
        if (
            !isPlatformReservedTag(node.tag) &&
            node.tag !== 'slot' &&
            node.attrsMap['inline-template'] == null
        ) {
            return
        }
        for (let i = 0, l = node.children.length; i < l; i++) {
            const child = node.children[i];
            markStatic$1(child);
            if (!child.static) {
                node.static = false;
            }
        }
        if (node.ifConditions) {
            for (let i = 1, l = node.ifConditions.length; i < l; i++) {
                const block = node.ifConditions[i].block;
                markStatic$1(block);
                if (!block.static) {
                    node.static = false;
                }
            }
        }
    }
}

function markStaticRoots(node, isInFor) {
    if (node.type === 1) {
        if (node.static || node.once) {
            node.staticInFor = isInFor;
        }
        // For a node to qualify as a static root, it should have children that
        // are not just static text. Otherwise the cost of hoisting out will
        // outweigh the benefits and it's better off to just always render it fresh.
        if (node.static && node.children.length && !(
            node.children.length === 1 &&
            node.children[0].type === 3
        )) {
            node.staticRoot = true;
            return
        } else {
            node.staticRoot = false;
        }
        if (node.children) {
            for (let i = 0, l = node.children.length; i < l; i++) {
                markStaticRoots(node.children[i], isInFor || !!node.for);
            }
        }
        if (node.ifConditions) {
            for (let i = 1, l = node.ifConditions.length; i < l; i++) {
                markStaticRoots(node.ifConditions[i].block, isInFor);
            }
        }
    }
}

function isStatic(node) {
    if (node.type === 2) { // expression
        return false
    }
    if (node.type === 3) { // text
        return true
    }
    return !!(node.pre || (
        !node.hasBindings && // no dynamic bindings
        !node.if && !node.for && // not v-if or v-for or v-else
        !isBuiltInTag(node.tag) && // not a built-in
        isPlatformReservedTag(node.tag) && // not a component
        !isDirectChildOfTemplateFor(node) &&
        Object.keys(node).every(isStaticKey)
    ))
}

function isDirectChildOfTemplateFor(node) {
    while (node.parent) {
        node = node.parent;
        if (node.tag !== 'template') {
            return false
        }
        if (node.for) {
            return true
        }
    }
    return false
}

/*  */

const fnExpRE = /^\s*([\w$_]+|\([^)]*?\))\s*=>|^function\s*\(/;
const simplePathRE = /^\s*[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['.*?']|\[".*?"]|\[\d+]|\[[A-Za-z_$][\w$]*])*\s*$/;

// keyCode aliases
const keyCodes = {
    esc: 27,
    tab: 9,
    enter: 13,
    space: 32,
    up: 38,
    left: 37,
    right: 39,
    down: 40,
    'delete': [8, 46]
};

// #4868: modifiers that prevent the execution of the listener
// need to explicitly return null so that we can determine whether to remove
// the listener for .once
const genGuard = condition =
>
`if(${condition})return null;`;

const modifierCode = {
    stop: '$event.stopPropagation();',
    prevent: '$event.preventDefault();',
    self: genGuard(`$event.target !== $event.currentTarget`),
    ctrl: genGuard(`!$event.ctrlKey`),
    shift: genGuard(`!$event.shiftKey`),
    alt: genGuard(`!$event.altKey`),
    meta: genGuard(`!$event.metaKey`),
    left: genGuard(`'button' in $event && $event.button !== 0`),
    middle: genGuard(`'button' in $event && $event.button !== 1`),
    right: genGuard(`'button' in $event && $event.button !== 2`)
};

function genHandlers(
    events,
    isNative,
    warn
) {
    let res = isNative ? 'nativeOn:{' : 'on:{';
    for (const name in events) {
        res += `"${name}":${genHandler(name, events[name])},`;
    }
    return res.slice(0, -1) + '}'
}

function genHandler(
    name,
    handler
) {
    if (!handler) {
        return 'function(){}'
    }

    if (Array.isArray(handler)) {
        return `[${handler.map(handler = > genHandler(name, handler)).join(',')}]`
    }

    const isMethodPath = simplePathRE.test(handler.value);
    const isFunctionExpression = fnExpRE.test(handler.value);

    if (!handler.modifiers) {
        return isMethodPath || isFunctionExpression
            ? handler.value
            : `function($event){${handler.value}}` // inline statement
    } else {
        let code = '';
        let genModifierCode = '';
        const keys = [];
        for (const key in handler.modifiers) {
            if (modifierCode[key]) {
                genModifierCode += modifierCode[key];
                // left/right
                if (keyCodes[key]) {
                    keys.push(key);
                }
            } else if (key === 'exact') {
                const modifiers = (handler.modifiers);
                genModifierCode += genGuard(
                    ['ctrl', 'shift', 'alt', 'meta']
                        .filter(keyModifier = > !modifiers[keyModifier])
                    .map(keyModifier = > `$event.${keyModifier}Key`
            )
            .
                join('||')
            )
                ;
            } else {
                keys.push(key);
            }
        }
        if (keys.length) {
            code += genKeyFilter(keys);
        }
        // Make sure modifiers like prevent and stop get executed after key filtering
        if (genModifierCode) {
            code += genModifierCode;
        }
        const handlerCode = isMethodPath
            ? handler.value + '($event)'
            : isFunctionExpression
                ? `(${handler.value})($event)`
                : handler.value;
        return `function($event){${code}${handlerCode}}`
    }
}

function genKeyFilter(keys) {
    return `if(!('button' in $event)&&${keys.map(genFilterCode).join('&&')})return null;`
}

function genFilterCode(key) {
    const keyVal = parseInt(key, 10);
    if (keyVal) {
        return `$event.keyCode!==${keyVal}`
    }
    const code = keyCodes[key];
    return (
        `_k($event.keyCode,` +
        `${JSON.stringify(key)},` +
        `${JSON.stringify(code)},` +
        `$event.key)`
    )
}

/*  */

function on(el, dir) {
    if ("development" !== 'production' && dir.modifiers) {
        warn(`v-on without argument does not support modifiers.`);
    }
    el.wrapListeners = (code) =
>
    `_g(${code},${dir.value})`;
}

/*  */

function bind$1(el, dir) {
    el.wrapData = (code) =
>
    {
        return `_b(${code},'${el.tag}',${dir.value},${
            dir.modifiers && dir.modifiers.prop ? 'true' : 'false'
            }${
            dir.modifiers && dir.modifiers.sync ? ',true' : ''
            })`
    }
    ;
}

/*  */

var baseDirectives = {
    on,
    bind: bind$1,
    cloak: noop
};

/*  */

class CodegenState {


    constructor(options) {
        this.options = options;
        this.warn = options.warn || baseWarn;
        this.transforms = pluckModuleFunction(options.modules, 'transformCode');
        this.dataGenFns = pluckModuleFunction(options.modules, 'genData');
        this.directives = extend(extend({}, baseDirectives), options.directives);
        const isReservedTag = options.isReservedTag || no;
        this.maybeComponent = (el) =
    >
        !isReservedTag(el.tag);
        this.onceId = 0;
        this.staticRenderFns = [];
    }
}


function generate(
    ast,
    options
) {
    const state = new CodegenState(options);
    const code = ast ? genElement(ast, state) : '_c("div")';
    return {
        render: `with(this){return ${code}}`,
        staticRenderFns: state.staticRenderFns
    }
}

function genElement(el, state) {
    if (el.staticRoot && !el.staticProcessed) {
        return genStatic(el, state)
    } else if (el.once && !el.onceProcessed) {
        return genOnce(el, state)
    } else if (el.for && !el.forProcessed) {
        return genFor(el, state)
    } else if (el.if && !el.ifProcessed) {
        return genIf(el, state)
    } else if (el.tag === 'template' && !el.slotTarget) {
        return genChildren(el, state) || 'void 0'
    } else if (el.tag === 'slot') {
        return genSlot(el, state)
    } else {
        // component or element
        let code;
        if (el.component) {
            code = genComponent(el.component, el, state);
        } else {
            const data = el.plain ? undefined : genData$2(el, state);

            const children = el.inlineTemplate ? null : genChildren(el, state, true);
            code = `_c('${el.tag}'${
                data ? `,${data}` : '' // data
                }${
                children ? `,${children}` : '' // children
                })`;
        }
        // module transforms
        for (let i = 0; i < state.transforms.length; i++) {
            code = state.transforms[i](el, code);
        }
        return code
    }
}

// hoist static sub-trees out
function genStatic(el, state, once$$1) {
    el.staticProcessed = true;
    state.staticRenderFns.push(`with(this){return ${genElement(el, state)}}`);
    return `_m(${
    state.staticRenderFns.length - 1
        },${
        el.staticInFor ? 'true' : 'false'
        },${
        once$$1 ? 'true' : 'false'
        })`
}

// v-once
function genOnce(el, state) {
    el.onceProcessed = true;
    if (el.if && !el.ifProcessed) {
        return genIf(el, state)
    } else if (el.staticInFor) {
        let key = '';
        let parent = el.parent;
        while (parent) {
            if (parent.for) {
                key = parent.key;
                break
            }
            parent = parent.parent;
        }
        if (!key) {
            "development" !== 'production' && state.warn(
                `v-once can only be used inside v-for that is keyed. `
            );
            return genElement(el, state)
        }
        return `_o(${genElement(el, state)},${state.onceId++},${key})`
    } else {
        return genStatic(el, state, true)
    }
}

function genIf(
    el,
    state,
    altGen,
    altEmpty
) {
    el.ifProcessed = true; // avoid recursion
    return genIfConditions(el.ifConditions.slice(), state, altGen, altEmpty)
}

function genIfConditions(
    conditions,
    state,
    altGen,
    altEmpty
) {
    if (!conditions.length) {
        return altEmpty || '_e()'
    }

    const condition = conditions.shift();
    if (condition.exp) {
        return `(${condition.exp})?${
            genTernaryExp(condition.block)
            }:${
            genIfConditions(conditions, state, altGen, altEmpty)
            }`
    } else {
        return `${genTernaryExp(condition.block)}`
    }

    // v-if with v-once should generate code like (a)?_m(0):_m(1)
    function genTernaryExp(el) {
        return altGen
            ? altGen(el, state)
            : el.once
                ? genOnce(el, state)
                : genElement(el, state)
    }
}

function genFor(
    el,
    state,
    altGen,
    altHelper
) {
    const exp = el.for;
    const alias = el.alias;
    const iterator1 = el.iterator1 ? `,${el.iterator1}` : '';
    const iterator2 = el.iterator2 ? `,${el.iterator2}` : '';

    if ("development" !== 'production' &&
        state.maybeComponent(el) &&
        el.tag !== 'slot' &&
        el.tag !== 'template' &&
        !el.key
    ) {
        state.warn(
            `<${el.tag} v-for="${alias} in ${exp}">: component lists rendered with ` +
            `v-for should have explicit keys. ` +
            `See https://vuejs.org/guide/list.html#key for more info.`,
            true /* tip */
        );
    }

    el.forProcessed = true; // avoid recursion
    return `${altHelper || '_l'}((${exp}),` +
        `function(${alias}${iterator1}${iterator2}){` +
        `return ${(altGen || genElement)(el, state)}` +
        '})'
}

function genData$2(el, state) {
    let data = '{';

    // directives first.
    // directives may mutate the el's other properties before they are generated.
    const dirs = genDirectives(el, state);
    if (dirs) data += dirs + ',';

    // key
    if (el.key) {
        data += `key:${el.key},`;
    }
    // ref
    if (el.ref) {
        data += `ref:${el.ref},`;
    }
    if (el.refInFor) {
        data += `refInFor:true,`;
    }
    // pre
    if (el.pre) {
        data += `pre:true,`;
    }
    // record original tag name for components using "is" attribute
    if (el.component) {
        data += `tag:"${el.tag}",`;
    }
    // module data generation functions
    for (let i = 0; i < state.dataGenFns.length; i++) {
        data += state.dataGenFns[i](el);
    }
    // attributes
    if (el.attrs) {
        data += `attrs:{${genProps(el.attrs)}},`;
    }
    // DOM props
    if (el.props) {
        data += `domProps:{${genProps(el.props)}},`;
    }
    // event handlers
    if (el.events) {
        data += `${genHandlers(el.events, false, state.warn)},`;
    }
    if (el.nativeEvents) {
        data += `${genHandlers(el.nativeEvents, true, state.warn)},`;
    }
    // slot target
    // only for non-scoped slots
    if (el.slotTarget && !el.slotScope) {
        data += `slot:${el.slotTarget},`;
    }
    // scoped slots
    if (el.scopedSlots) {
        data += `${genScopedSlots(el.scopedSlots, state)},`;
    }
    // component v-model
    if (el.model) {
        data += `model:{value:${
            el.model.value
            },callback:${
            el.model.callback
            },expression:${
            el.model.expression
            }},`;
    }
    // inline-template
    if (el.inlineTemplate) {
        const inlineTemplate = genInlineTemplate(el, state);
        if (inlineTemplate) {
            data += `${inlineTemplate},`;
        }
    }
    data = data.replace(/,$/, '') + '}';
    // v-bind data wrap
    if (el.wrapData) {
        data = el.wrapData(data);
    }
    // v-on data wrap
    if (el.wrapListeners) {
        data = el.wrapListeners(data);
    }
    return data
}

function genDirectives(el, state) {
    const dirs = el.directives;
    if (!dirs) return
    let res = 'directives:[';
    let hasRuntime = false;
    let i, l, dir, needRuntime;
    for (i = 0, l = dirs.length; i < l; i++) {
        dir = dirs[i];
        needRuntime = true;
        const gen = state.directives[dir.name];
        if (gen) {
            // compile-time directive that manipulates AST.
            // returns true if it also needs a runtime counterpart.
            needRuntime = !!gen(el, dir, state.warn);
        }
        if (needRuntime) {
            hasRuntime = true;
            res += `{name:"${dir.name}",rawName:"${dir.rawName}"${
                dir.value ? `,value:(${dir.value}),expression:${JSON.stringify(dir.value)}` : ''
                }${
                dir.arg ? `,arg:"${dir.arg}"` : ''
                }${
                dir.modifiers ? `,modifiers:${JSON.stringify(dir.modifiers)}` : ''
                }},`;
        }
    }
    if (hasRuntime) {
        return res.slice(0, -1) + ']'
    }
}

function genInlineTemplate(el, state) {
    const ast = el.children[0];
    if ("development" !== 'production' && (
        el.children.length !== 1 || ast.type !== 1
    )) {
        state.warn('Inline-template components must have exactly one child element.');
    }
    if (ast.type === 1) {
        const inlineRenderFns = generate(ast, state.options);
        return `inlineTemplate:{render:function(){${
            inlineRenderFns.render
            }},staticRenderFns:[${
        inlineRenderFns.staticRenderFns.map(code = > `function(){${code}}`).join(',')
            }]}`
    }
}

function genScopedSlots(
    slots,
    state
) {
    return `scopedSlots:_u([${
    Object.keys(slots).map(key = > {
        return genScopedSlot(key, slots[key], state)
    }).join(',')
        }])`
}

function genScopedSlot(
    key,
    el,
    state
) {
    if (el.for && !el.forProcessed) {
        return genForScopedSlot(key, el, state)
    }
    const fn = `function(${String(el.slotScope)}){` +
        `return ${el.tag === 'template'
            ? el.if
                ? `${el.if}?${genChildren(el, state) || 'undefined'}:undefined`
                : genChildren(el, state) || 'undefined'
            : genElement(el, state)
            }}`;
    return `{key:${key},fn:${fn}}`
}

function genForScopedSlot(
    key,
    el,
    state
) {
    const exp = el.for;
    const alias = el.alias;
    const iterator1 = el.iterator1 ? `,${el.iterator1}` : '';
    const iterator2 = el.iterator2 ? `,${el.iterator2}` : '';
    el.forProcessed = true; // avoid recursion
    return `_l((${exp}),` +
        `function(${alias}${iterator1}${iterator2}){` +
        `return ${genScopedSlot(key, el, state)}` +
        '})'
}

function genChildren(
    el,
    state,
    checkSkip,
    altGenElement,
    altGenNode
) {
    const children = el.children;
    if (children.length) {
        const el = children[0];
        // optimize single v-for
        if (children.length === 1 &&
            el.for &&
            el.tag !== 'template' &&
            el.tag !== 'slot'
        ) {
            return (altGenElement || genElement)(el, state)
        }
        const normalizationType = checkSkip
            ? getNormalizationType(children, state.maybeComponent)
            : 0;
        const gen = altGenNode || genNode;
        return `[${children.map(c = > gen(c, state)).join(',')}]${
            normalizationType ? `,${normalizationType}` : ''
            }`
    }
}

// determine the normalization needed for the children array.
// 0: no normalization needed
// 1: simple normalization needed (possible 1-level deep nested array)
// 2: full normalization needed
function getNormalizationType(
    children,
    maybeComponent
) {
    let res = 0;
    for (let i = 0; i < children.length; i++) {
        const el = children[i];
        if (el.type !== 1) {
            continue
        }
        if (needsNormalization(el) ||
            (el.ifConditions && el.ifConditions.some(c = > needsNormalization(c.block))))
        {
            res = 2;
            break
        }
        if (maybeComponent(el) ||
            (el.ifConditions && el.ifConditions.some(c = > maybeComponent(c.block))))
        {
            res = 1;
        }
    }
    return res
}

function needsNormalization(el) {
    return el.for !== undefined || el.tag === 'template' || el.tag === 'slot'
}

function genNode(node, state) {
    if (node.type === 1) {
        return genElement(node, state)
    }
    if (node.type === 3 && node.isComment) {
        return genComment(node)
    } else {
        return genText(node)
    }
}

function genText(text) {
    return `_v(${text.type === 2
        ? text.expression // no need for () because already wrapped in _s()
        : transformSpecialNewlines(JSON.stringify(text.text))
        })`
}

function genComment(comment) {
    return `_e(${JSON.stringify(comment.text)})`
}

function genSlot(el, state) {
    const slotName = el.slotName || '"default"';
    const children = genChildren(el, state);
    let res = `_t(${slotName}${children ? `,${children}` : ''}`;
    const attrs = el.attrs && `{${el.attrs.map(a = > `${camelize(a.name)}:${a.value}`).join(',')}}`;
    const bind$$1 = el.attrsMap['v-bind'];
    if ((attrs || bind$$1) && !children) {
        res += `,null`;
    }
    if (attrs) {
        res += `,${attrs}`;
    }
    if (bind$$1) {
        res += `${attrs ? '' : ',null'},${bind$$1}`;
    }
    return res + ')'
}

// componentName is el.component, take it as argument to shun flow's pessimistic refinement
function genComponent(
    componentName,
    el,
    state
) {
    const children = el.inlineTemplate ? null : genChildren(el, state, true);
    return `_c(${componentName},${genData$2(el, state)}${
        children ? `,${children}` : ''
        })`
}

function genProps(props) {
    let res = '';
    for (let i = 0; i < props.length; i++) {
        const prop = props[i];
        res += `"${prop.name}":${transformSpecialNewlines(prop.value)},`;
    }
    return res.slice(0, -1)
}

// #3895, #4268
function transformSpecialNewlines(text) {
    return text
        .replace(/\u2028/g, '\\u2028')
        .replace(/\u2029/g, '\\u2029')
}

/*  */

// these keywords should not appear inside expressions, but operators like
// typeof, instanceof and in are allowed
const prohibitedKeywordRE = new RegExp('\\b' + (
    'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
    'super,throw,while,yield,delete,export,import,return,switch,default,' +
    'extends,finally,continue,debugger,function,arguments'
).split(',').join('\\b|\\b') + '\\b');

// these unary operators should not be used as property/method names
const unaryOperatorsRE = new RegExp('\\b' + (
    'delete,typeof,void'
).split(',').join('\\s*\\([^\\)]*\\)|\\b') + '\\s*\\([^\\)]*\\)');

// strip strings in expressions
const stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g;

// detect problematic expressions in a template
function detectErrors(ast) {
    const errors = [];
    if (ast) {
        checkNode(ast, errors);
    }
    return errors
}

function checkNode(node, errors) {
    if (node.type === 1) {
        for (const name in node.attrsMap) {
            if (dirRE.test(name)) {
                const value = node.attrsMap[name];
                if (value) {
                    if (name === 'v-for') {
                        checkFor(node, `v-for="${value}"`, errors);
                    } else if (onRE.test(name)) {
                        checkEvent(value, `${name}="${value}"`, errors);
                    } else {
                        checkExpression(value, `${name}="${value}"`, errors);
                    }
                }
            }
        }
        if (node.children) {
            for (let i = 0; i < node.children.length; i++) {
                checkNode(node.children[i], errors);
            }
        }
    } else if (node.type === 2) {
        checkExpression(node.expression, node.text, errors);
    }
}

function checkEvent(exp, text, errors) {
    const stipped = exp.replace(stripStringRE, '');
    const keywordMatch = stipped.match(unaryOperatorsRE);
    if (keywordMatch && stipped.charAt(keywordMatch.index - 1) !== '$') {
        errors.push(
            `avoid using JavaScript unary operator as property name: ` +
            `"${keywordMatch[0]}" in expression ${text.trim()}`
        );
    }
    checkExpression(exp, text, errors);
}

function checkFor(node, text, errors) {
    checkExpression(node.for || '', text, errors);
    checkIdentifier(node.alias, 'v-for alias', text, errors);
    checkIdentifier(node.iterator1, 'v-for iterator', text, errors);
    checkIdentifier(node.iterator2, 'v-for iterator', text, errors);
}

function checkIdentifier(
    ident,
    type,
    text,
    errors
) {
    if (typeof ident === 'string') {
        try {
            new Function(`var ${ident}=_`);
        } catch (e) {
            errors.push(`invalid ${type} "${ident}" in expression: ${text.trim()}`);
        }
    }
}

function checkExpression(exp, text, errors) {
    try {
        new Function(`return ${exp}`);
    } catch (e) {
        const keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE);
        if (keywordMatch) {
            errors.push(
                `avoid using JavaScript keyword as property name: ` +
                `"${keywordMatch[0]}"\n  Raw expression: ${text.trim()}`
            );
        } else {
            errors.push(
                `invalid expression: ${e.message} in\n\n` +
                `    ${exp}\n\n` +
                `  Raw expression: ${text.trim()}\n`
            );
        }
    }
}

/*  */

function createFunction(code, errors) {
    try {
        return new Function(code)
    } catch (err) {
        errors.push({err, code});
        return noop
    }
}

function createCompileToFunctionFn(compile) {
    const cache = Object.create(null);

    return function compileToFunctions(
        template,
        options,
        vm
    ) {
        options = extend({}, options);
        const warn$$1 = options.warn || warn;
        delete options.warn;

        /* istanbul ignore if */
        {
            // detect possible CSP restriction
            try {
                new Function('return 1');
            } catch (e) {
                if (e.toString().match(/unsafe-eval|CSP/)) {
                    warn$$1(
                        'It seems you are using the standalone build of Vue.js in an ' +
                        'environment with Content Security Policy that prohibits unsafe-eval. ' +
                        'The template compiler cannot work in this environment. Consider ' +
                        'relaxing the policy to allow unsafe-eval or pre-compiling your ' +
                        'templates into render functions.'
                    );
                }
            }
        }

        // check cache
        const key = options.delimiters
            ? String(options.delimiters) + template
            : template;
        if (cache[key]) {
            return cache[key]
        }

        // compile
        const compiled = compile(template, options);

        // check compilation errors/tips
        {
            if (compiled.errors && compiled.errors.length) {
                warn$$1(
                    `Error compiling template:\n\n${template}\n\n` +
                    compiled.errors.map(e = > `- ${e}`).join('\n') + '\n',
                    vm
            )
                ;
            }
            if (compiled.tips && compiled.tips.length) {
                compiled.tips.forEach(msg = > tip(msg, vm)
            )
                ;
            }
        }

        // turn code into functions
        const res = {};
        const fnGenErrors = [];
        res.render = createFunction(compiled.render, fnGenErrors);
        res.staticRenderFns = compiled.staticRenderFns.map(code = > {
            return createFunction(code, fnGenErrors)
        }
    )
        ;

        // check function generation errors.
        // this should only happen if there is a bug in the compiler itself.
        // mostly for codegen development use
        /* istanbul ignore if */
        {
            if ((!compiled.errors || !compiled.errors.length) && fnGenErrors.length) {
                warn$$1(
                    `Failed to generate render function:\n\n` +
                    fnGenErrors.map(({err, code}) = > `${err.toString()} in\n\n${code}\n`).join('\n'),
                    vm
            )
                ;
            }
        }

        return (cache[key] = res)
    }
}

/*  */

function createCompilerCreator(baseCompile) {
    return function createCompiler(baseOptions) {
        function compile(
            template,
            options
        ) {
            const finalOptions = Object.create(baseOptions);
            const errors = [];
            const tips = [];
            finalOptions.warn = (msg, tip) =
        >
            {
                (tip ? tips : errors).push(msg);
            }
            ;

            if (options) {
                // merge custom modules
                if (options.modules) {
                    finalOptions.modules =
                        (baseOptions.modules || []).concat(options.modules);
                }
                // merge custom directives
                if (options.directives) {
                    finalOptions.directives = extend(
                        Object.create(baseOptions.directives),
                        options.directives
                    );
                }
                // copy other options
                for (const key in options) {
                    if (key !== 'modules' && key !== 'directives') {
                        finalOptions[key] = options[key];
                    }
                }
            }

            const compiled = baseCompile(template, finalOptions);
            {
                errors.push.apply(errors, detectErrors(compiled.ast));
            }
            compiled.errors = errors;
            compiled.tips = tips;
            return compiled
        }

        return {
            compile,
            compileToFunctions: createCompileToFunctionFn(compile)
        }
    }
}

/*  */

// `createCompilerCreator` allows creating compilers that use alternative
// parser/optimizer/codegen, e.g the SSR optimizing compiler.
// Here we just export a default compiler using the default parts.
const createCompiler = createCompilerCreator(function baseCompile(
    template,
    options
) {
    const ast = parse(template.trim(), options);
    optimize(ast, options);
    const code = generate(ast, options);
    return {
        ast,
        render: code.render,
        staticRenderFns: code.staticRenderFns
    }
});

/*  */

const {compile, compileToFunctions} = createCompiler(baseOptions);

/*  */

// check whether current browser encodes a char inside attribute values
let div;

function getShouldDecode(href) {
    div = div || document.createElement('div');
    div.innerHTML = href ? `<a href="\n"/>` : `<div a="\n"/>`;
    return div.innerHTML.indexOf('&#10;') > 0
}

// #3663: IE encodes newlines inside attribute values while other browsers don't
const shouldDecodeNewlines = inBrowser ? getShouldDecode(false) : false;
// #6828: chrome encodes content in a[href]
const shouldDecodeNewlinesForHref = inBrowser ? getShouldDecode(true) : false;

/*  */

const idToTemplate = cached(id = > {
    const el = query(id);
return el && el.innerHTML
})
;

const mount = Vue$3.prototype.$mount;
Vue$3.prototype.$mount = function (
    el,
    hydrating
) {
    el = el && query(el);

    /* istanbul ignore if */
    if (el === document.body || el === document.documentElement) {
        "development" !== 'production' && warn(
            `Do not mount Vue to <html> or <body> - mount to normal elements instead.`
        );
        return this
    }

    const options = this.$options;
    // resolve template/el and convert to render function
    if (!options.render) {
        let template = options.template;
        if (template) {
            if (typeof template === 'string') {
                if (template.charAt(0) === '#') {
                    template = idToTemplate(template);
                    /* istanbul ignore if */
                    if ("development" !== 'production' && !template) {
                        warn(
                            `Template element not found or is empty: ${options.template}`,
                            this
                        );
                    }
                }
            } else if (template.nodeType) {
                template = template.innerHTML;
            } else {
                {
                    warn('invalid template option:' + template, this);
                }
                return this
            }
        } else if (el) {
            template = getOuterHTML(el);
        }
        if (template) {
            /* istanbul ignore if */
            if ("development" !== 'production' && config.performance && mark) {
                mark('compile');
            }

            const {render, staticRenderFns} = compileToFunctions(template, {
                shouldDecodeNewlines,
                shouldDecodeNewlinesForHref,
                delimiters: options.delimiters,
                comments: options.comments
            }, this);
            options.render = render;
            options.staticRenderFns = staticRenderFns;

            /* istanbul ignore if */
            if ("development" !== 'production' && config.performance && mark) {
                mark('compile end');
                measure(`vue ${this._name} compile`, 'compile', 'compile end');
            }
        }
    }
    return mount.call(this, el, hydrating)
};

/**
 * Get outerHTML of elements, taking care
 * of SVG elements in IE as well.
 */
function getOuterHTML(el) {
    if (el.outerHTML) {
        return el.outerHTML
    } else {
        const container = document.createElement('div');
        container.appendChild(el.cloneNode(true));
        return container.innerHTML
    }
}

Vue$3.compile = compileToFunctions;

export default Vue$3;
